source3/smbd/open.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    file opening and share modes
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2004
   6    Copyright (C) Volker Lendecke 2005
   7    Copyright (C) Ralph Boehme 2017
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/filesys.h"
  25 #include "lib/util/server_id.h"
  26 #include "printing.h"
  27 #include "smbd/smbd.h"
  28 #include "smbd/globals.h"
  29 #include "fake_file.h"
  30 #include "../libcli/security/security.h"
  31 #include "../librpc/gen_ndr/ndr_security.h"
  32 #include "../librpc/gen_ndr/ndr_open_files.h"
  33 #include "../librpc/gen_ndr/idmap.h"
  34 #include "../librpc/gen_ndr/ioctl.h"
  35 #include "passdb/lookup_sid.h"
  36 #include "auth.h"
  37 #include "serverid.h"
  38 #include "messages.h"
  39 #include "source3/lib/dbwrap/dbwrap_watch.h"
  40 #include "locking/leases_db.h"
  41 #include "librpc/gen_ndr/ndr_leases_db.h"
  42
  43 extern const struct generic_mapping file_generic_mapping;
  44
  45 struct deferred_open_record {
  46         bool delayed_for_oplocks;
  47         bool async_open;
  48         struct file_id id;
  49
  50         /*
  51          * Timer for async opens, needed because they don't use a watch on
  52          * a locking.tdb record. This is currently only used for real async
  53          * opens and just terminates smbd if the async open times out.
  54          */
  55         struct tevent_timer *te;
  56 };
  57
  58 /****************************************************************************
  59  If the requester wanted DELETE_ACCESS and was rejected because
  60  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
  61  overrides this.
  62 ****************************************************************************/
  63
  64 static bool parent_override_delete(connection_struct *conn,
  65                                         const struct smb_filename *smb_fname,
  66                                         uint32_t access_mask,
  67                                         uint32_t rejected_mask)
  68 {
  69         if ((access_mask & DELETE_ACCESS) &&
  70                     (rejected_mask & DELETE_ACCESS) &&
  71                     can_delete_file_in_directory(conn, smb_fname)) {
  72                 return true;
  73         }
  74         return false;
  75 }
  76
  77 /****************************************************************************
  78  Check if we have open rights.
  79 ****************************************************************************/
  80
  81 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
  82                                 const struct smb_filename *smb_fname,
  83                                 bool use_privs,
  84                                 uint32_t access_mask)
  85 {
  86         /* Check if we have rights to open. */
  87         NTSTATUS status;
  88         struct security_descriptor *sd = NULL;
  89         uint32_t rejected_share_access;
  90         uint32_t rejected_mask = access_mask;
  91         uint32_t do_not_check_mask = 0;
  92
  93         rejected_share_access = access_mask & ~(conn->share_access);
  94
  95         if (rejected_share_access) {
  96                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
  97                         "on %s (0x%x)\n",
  98                         (unsigned int)access_mask,
  99                         smb_fname_str_dbg(smb_fname),
 100                         (unsigned int)rejected_share_access ));
 101                 return NT_STATUS_ACCESS_DENIED;
 102         }
 103
 104         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
 105                 /* I'm sorry sir, I didn't know you were root... */
 106                 DEBUG(10,("smbd_check_access_rights: root override "
 107                         "on %s. Granting 0x%x\n",
 108                         smb_fname_str_dbg(smb_fname),
 109                         (unsigned int)access_mask ));
 110                 return NT_STATUS_OK;
 111         }
 112
 113         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
 114                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 115                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
 116                         smb_fname_str_dbg(smb_fname),
 117                         (unsigned int)access_mask ));
 118                 return NT_STATUS_OK;
 119         }
 120
 121         if (access_mask == DELETE_ACCESS &&
 122                         VALID_STAT(smb_fname->st) &&
 123                         S_ISLNK(smb_fname->st.st_ex_mode)) {
 124                 /* We can always delete a symlink. */
 125                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 126                         "on DELETE_ACCESS on symlink %s.\n",
 127                         smb_fname_str_dbg(smb_fname) ));
 128                 return NT_STATUS_OK;
 129         }
 130
 131         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
 132                         (SECINFO_OWNER |
 133                         SECINFO_GROUP |
 134                          SECINFO_DACL), talloc_tos(), &sd);
 135
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
 138                         "on %s: %s\n",
 139                         smb_fname_str_dbg(smb_fname),
 140                         nt_errstr(status)));
 141
 142                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 143                         goto access_denied;
 144                 }
 145
 146                 return status;
 147         }
 148
 149         /*
 150          * If we can access the path to this file, by
 151          * default we have FILE_READ_ATTRIBUTES from the
 152          * containing directory. See the section:
 153          * "Algorithm to Check Access to an Existing File"
 154          * in MS-FSA.pdf.
 155          *
 156          * se_file_access_check() also takes care of
 157          * owner WRITE_DAC and READ_CONTROL.
 158          */
 159         do_not_check_mask = FILE_READ_ATTRIBUTES;
 160
 161         /*
 162          * Samba 3.6 and earlier granted execute access even
 163          * if the ACL did not contain execute rights.
 164          * Samba 4.0 is more correct and checks it.
 165          * The compatibilty mode allows one to skip this check
 166          * to smoothen upgrades.
 167          */
 168         if (lp_acl_allow_execute_always(SNUM(conn))) {
 169                 do_not_check_mask |= FILE_EXECUTE;
 170         }
 171
 172         status = se_file_access_check(sd,
 173                                 get_current_nttok(conn),
 174                                 use_privs,
 175                                 (access_mask & ~do_not_check_mask),
 176                                 &rejected_mask);
 177
 178         DEBUG(10,("smbd_check_access_rights: file %s requesting "
 179                 "0x%x returning 0x%x (%s)\n",
 180                 smb_fname_str_dbg(smb_fname),
 181                 (unsigned int)access_mask,
 182                 (unsigned int)rejected_mask,
 183                 nt_errstr(status) ));
 184
 185         if (!NT_STATUS_IS_OK(status)) {
 186                 if (DEBUGLEVEL >= 10) {
 187                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
 188                                 smb_fname_str_dbg(smb_fname) ));
 189                         NDR_PRINT_DEBUG(security_descriptor, sd);
 190                 }
 191         }
 192
 193         TALLOC_FREE(sd);
 194
 195         if (NT_STATUS_IS_OK(status) ||
 196                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 197                 return status;
 198         }
 199
 200         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
 201
 202   access_denied:
 203
 204         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
 205                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
 206                         !lp_store_dos_attributes(SNUM(conn)) &&
 207                         (lp_map_readonly(SNUM(conn)) ||
 208                         lp_map_archive(SNUM(conn)) ||
 209                         lp_map_hidden(SNUM(conn)) ||
 210                         lp_map_system(SNUM(conn)))) {
 211                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
 212
 213                 DEBUG(10,("smbd_check_access_rights: "
 214                         "overrode "
 215                         "FILE_WRITE_ATTRIBUTES "
 216                         "on file %s\n",
 217                         smb_fname_str_dbg(smb_fname)));
 218         }
 219
 220         if (parent_override_delete(conn,
 221                                 smb_fname,
 222                                 access_mask,
 223                                 rejected_mask)) {
 224                 /* Were we trying to do an open
 225                  * for delete and didn't get DELETE
 226                  * access (only) ? Check if the
 227                  * directory allows DELETE_CHILD.
 228                  * See here:
 229                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
 230                  * for details. */
 231
 232                 rejected_mask &= ~DELETE_ACCESS;
 233
 234                 DEBUG(10,("smbd_check_access_rights: "
 235                         "overrode "
 236                         "DELETE_ACCESS on "
 237                         "file %s\n",
 238                         smb_fname_str_dbg(smb_fname)));
 239         }
 240
 241         if (rejected_mask != 0) {
 242                 return NT_STATUS_ACCESS_DENIED;
 243         }
 244         return NT_STATUS_OK;
 245 }
 246
 247 NTSTATUS check_parent_access(struct connection_struct *conn,
 248                                 struct smb_filename *smb_fname,
 249                                 uint32_t access_mask)
 250 {
 251         NTSTATUS status;
 252         char *parent_dir = NULL;
 253         struct security_descriptor *parent_sd = NULL;
 254         uint32_t access_granted = 0;
 255         struct smb_filename *parent_smb_fname = NULL;
 256         struct share_mode_lock *lck = NULL;
 257         struct file_id id = {0};
 258         uint32_t name_hash;
 259         bool delete_on_close_set;
 260         int ret;
 261         TALLOC_CTX *frame = talloc_stackframe();
 262
 263         if (!parent_dirname(frame,
 264                                 smb_fname->base_name,
 265                                 &parent_dir,
 266                                 NULL)) {
 267                 status = NT_STATUS_NO_MEMORY;
 268                 goto out;
 269         }
 270
 271         parent_smb_fname = synthetic_smb_fname(frame,
 272                                 parent_dir,
 273                                 NULL,
 274                                 NULL,
 275                                 smb_fname->flags);
 276         if (parent_smb_fname == NULL) {
 277                 status = NT_STATUS_NO_MEMORY;
 278                 goto out;
 279         }
 280
 281         if (get_current_uid(conn) == (uid_t)0) {
 282                 /* I'm sorry sir, I didn't know you were root... */
 283                 DEBUG(10,("check_parent_access: root override "
 284                         "on %s. Granting 0x%x\n",
 285                         smb_fname_str_dbg(smb_fname),
 286                         (unsigned int)access_mask ));
 287                 status = NT_STATUS_OK;
 288                 goto out;
 289         }
 290
 291         status = SMB_VFS_GET_NT_ACL(conn,
 292                                 parent_smb_fname,
 293                                 SECINFO_DACL,
 294                                 frame,
 295                                 &parent_sd);
 296
 297         if (!NT_STATUS_IS_OK(status)) {
 298                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 299                         "%s with error %s\n",
 300                         parent_dir,
 301                         nt_errstr(status)));
 302                 goto out;
 303         }
 304
 305         /*
 306          * If we can access the path to this file, by
 307          * default we have FILE_READ_ATTRIBUTES from the
 308          * containing directory. See the section:
 309          * "Algorithm to Check Access to an Existing File"
 310          * in MS-FSA.pdf.
 311          *
 312          * se_file_access_check() also takes care of
 313          * owner WRITE_DAC and READ_CONTROL.
 314          */
 315         status = se_file_access_check(parent_sd,
 316                                 get_current_nttok(conn),
 317                                 false,
 318                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 319                                 &access_granted);
 320         if(!NT_STATUS_IS_OK(status)) {
 321                 DEBUG(5,("check_parent_access: access check "
 322                         "on directory %s for "
 323                         "path %s for mask 0x%x returned (0x%x) %s\n",
 324                         parent_dir,
 325                         smb_fname->base_name,
 326                         access_mask,
 327                         access_granted,
 328                         nt_errstr(status) ));
 329                 goto out;
 330         }
 331
 332         if (!(access_mask & (SEC_DIR_ADD_FILE | SEC_DIR_ADD_SUBDIR))) {
 333                 status = NT_STATUS_OK;
 334                 goto out;
 335         }
 336         if (!lp_check_parent_directory_delete_on_close(SNUM(conn))) {
 337                 status = NT_STATUS_OK;
 338                 goto out;
 339         }
 340
 341         /* Check if the directory has delete-on-close set */
 342         ret = SMB_VFS_STAT(conn, parent_smb_fname);
 343         if (ret != 0) {
 344                 status = map_nt_error_from_unix(errno);
 345                 goto out;
 346         }
 347
 348         id = SMB_VFS_FILE_ID_CREATE(conn, &parent_smb_fname->st);
 349
 350         status = file_name_hash(conn, parent_smb_fname->base_name, &name_hash);
 351         if (!NT_STATUS_IS_OK(status)) {
 352                 goto out;
 353         }
 354
 355         lck = get_existing_share_mode_lock(frame, id);
 356         if (lck == NULL) {
 357                 status = NT_STATUS_OK;
 358                 goto out;
 359         }
 360
 361         delete_on_close_set = is_delete_on_close_set(lck, name_hash);
 362         if (delete_on_close_set) {
 363                 status = NT_STATUS_DELETE_PENDING;
 364                 goto out;
 365         }
 366
 367         status = NT_STATUS_OK;
 368
 369 out:
 370         TALLOC_FREE(frame);
 371         return status;
 372 }
 373
 374 /****************************************************************************
 375  Ensure when opening a base file for a stream open that we have permissions
 376  to do so given the access mask on the base file.
 377 ****************************************************************************/
 378
 379 static NTSTATUS check_base_file_access(struct connection_struct *conn,
 380                                 struct smb_filename *smb_fname,
 381                                 uint32_t access_mask)
 382 {
 383         NTSTATUS status;
 384
 385         status = smbd_calculate_access_mask(conn, smb_fname,
 386                                         false,
 387                                         access_mask,
 388                                         &access_mask);
 389         if (!NT_STATUS_IS_OK(status)) {
 390                 DEBUG(10, ("smbd_calculate_access_mask "
 391                         "on file %s returned %s\n",
 392                         smb_fname_str_dbg(smb_fname),
 393                         nt_errstr(status)));
 394                 return status;
 395         }
 396
 397         if (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) {
 398                 uint32_t dosattrs;
 399                 if (!CAN_WRITE(conn)) {
 400                         return NT_STATUS_ACCESS_DENIED;
 401                 }
 402                 dosattrs = dos_mode(conn, smb_fname);
 403                 if (IS_DOS_READONLY(dosattrs)) {
 404                         return NT_STATUS_ACCESS_DENIED;
 405                 }
 406         }
 407
 408         return smbd_check_access_rights(conn,
 409                                         smb_fname,
 410                                         false,
 411                                         access_mask);
 412 }
 413
 414 /****************************************************************************
 415  Handle differing symlink errno's
 416 ****************************************************************************/
 417
 418 static int link_errno_convert(int err)
 419 {
 420 #if defined(ENOTSUP) && defined(OSF1)
 421         /* handle special Tru64 errno */
 422         if (err == ENOTSUP) {
 423                 err = ELOOP;
 424         }
 425 #endif /* ENOTSUP */
 426 #ifdef EFTYPE
 427         /* fix broken NetBSD errno */
 428         if (err == EFTYPE) {
 429                 err = ELOOP;
 430         }
 431 #endif /* EFTYPE */
 432         /* fix broken FreeBSD errno */
 433         if (err == EMLINK) {
 434                 err = ELOOP;
 435         }
 436         return err;
 437 }
 438
 439 static int non_widelink_open(struct connection_struct *conn,
 440                         const struct smb_filename *conn_rootdir_fname,
 441                         files_struct *fsp,
 442                         struct smb_filename *smb_fname,
 443                         int flags,
 444                         mode_t mode,
 445                         unsigned int link_depth);
 446
 447 /****************************************************************************
 448  Follow a symlink in userspace.
 449 ****************************************************************************/
 450
 451 static int process_symlink_open(struct connection_struct *conn,
 452                         const struct smb_filename *conn_rootdir_fname,
 453                         files_struct *fsp,
 454                         struct smb_filename *smb_fname,
 455                         int flags,
 456                         mode_t mode,
 457                         unsigned int link_depth)
 458 {
 459         int fd = -1;
 460         char *link_target = NULL;
 461         struct smb_filename target_fname = {0};
 462         int link_len = -1;
 463         struct smb_filename *oldwd_fname = NULL;
 464         size_t rootdir_len = 0;
 465         struct smb_filename *resolved_fname = NULL;
 466         char *resolved_name = NULL;
 467         bool matched = false;
 468         int saved_errno = 0;
 469
 470         /*
 471          * Ensure we don't get stuck in a symlink loop.
 472          */
 473         link_depth++;
 474         if (link_depth >= 20) {
 475                 errno = ELOOP;
 476                 goto out;
 477         }
 478
 479         /* Allocate space for the link target. */
 480         link_target = talloc_array(talloc_tos(), char, PATH_MAX);
 481         if (link_target == NULL) {
 482                 errno = ENOMEM;
 483                 goto out;
 484         }
 485
 486         /* Read the link target. */
 487         link_len = SMB_VFS_READLINK(conn,
 488                                 smb_fname,
 489                                 link_target,
 490                                 PATH_MAX - 1);
 491         if (link_len == -1) {
 492                 goto out;
 493         }
 494
 495         /* Ensure it's at least null terminated. */
 496         link_target[link_len] = '\0';
 497         target_fname = (struct smb_filename){ .base_name = link_target };
 498
 499         /* Convert to an absolute path. */
 500         resolved_fname = SMB_VFS_REALPATH(conn, talloc_tos(), &target_fname);
 501         if (resolved_fname == NULL) {
 502                 goto out;
 503         }
 504         resolved_name = resolved_fname->base_name;
 505
 506         /*
 507          * We know conn_rootdir starts with '/' and
 508          * does not end in '/'. FIXME ! Should we
 509          * smb_assert this ?
 510          */
 511         rootdir_len = strlen(conn_rootdir_fname->base_name);
 512
 513         matched = (strncmp(conn_rootdir_fname->base_name,
 514                                 resolved_name,
 515                                 rootdir_len) == 0);
 516         if (!matched) {
 517                 errno = EACCES;
 518                 goto out;
 519         }
 520
 521         /*
 522          * Turn into a path relative to the share root.
 523          */
 524         if (resolved_name[rootdir_len] == '\0') {
 525                 /* Link to the root of the share. */
 526                 TALLOC_FREE(smb_fname->base_name);
 527                 smb_fname->base_name = talloc_strdup(smb_fname, ".");
 528         } else if (resolved_name[rootdir_len] == '/') {
 529                 TALLOC_FREE(smb_fname->base_name);
 530                 smb_fname->base_name = talloc_strdup(smb_fname,
 531                                         &resolved_name[rootdir_len+1]);
 532         } else {
 533                 errno = EACCES;
 534                 goto out;
 535         }
 536
 537         if (smb_fname->base_name == NULL) {
 538                 errno = ENOMEM;
 539                 goto out;
 540         }
 541
 542         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
 543         if (oldwd_fname == NULL) {
 544                 goto out;
 545         }
 546
 547         /* Ensure we operate from the root of the share. */
 548         if (vfs_ChDir(conn, conn_rootdir_fname) == -1) {
 549                 goto out;
 550         }
 551
 552         /* And do it all again.. */
 553         fd = non_widelink_open(conn,
 554                                 conn_rootdir_fname,
 555                                 fsp,
 556                                 smb_fname,
 557                                 flags,
 558                                 mode,
 559                                 link_depth);
 560         if (fd == -1) {
 561                 saved_errno = errno;
 562         }
 563
 564   out:
 565
 566         TALLOC_FREE(resolved_fname);
 567         TALLOC_FREE(link_target);
 568         if (oldwd_fname != NULL) {
 569                 int ret = vfs_ChDir(conn, oldwd_fname);
 570                 if (ret == -1) {
 571                         smb_panic("unable to get back to old directory\n");
 572                 }
 573                 TALLOC_FREE(oldwd_fname);
 574         }
 575         if (saved_errno != 0) {
 576                 errno = saved_errno;
 577         }
 578         return fd;
 579 }
 580
 581 /****************************************************************************
 582  Non-widelink open.
 583 ****************************************************************************/
 584
 585 static int non_widelink_open(struct connection_struct *conn,
 586                         const struct smb_filename *conn_rootdir_fname,
 587                         files_struct *fsp,
 588                         struct smb_filename *smb_fname,
 589                         int flags,
 590                         mode_t mode,
 591                         unsigned int link_depth)
 592 {
 593         NTSTATUS status;
 594         int fd = -1;
 595         struct smb_filename *smb_fname_rel = NULL;
 596         int saved_errno = 0;
 597         struct smb_filename *oldwd_fname = NULL;
 598         char *parent_dir = NULL;
 599         struct smb_filename parent_dir_fname = {0};
 600         const char *final_component = NULL;
 601         bool is_directory = false;
 602         bool ok;
 603
 604 #ifdef O_DIRECTORY
 605         if (flags & O_DIRECTORY) {
 606                 is_directory = true;
 607         }
 608 #endif
 609
 610         if (is_directory) {
 611                 parent_dir = talloc_strdup(talloc_tos(), smb_fname->base_name);
 612                 if (parent_dir == NULL) {
 613                         saved_errno = errno;
 614                         goto out;
 615                 }
 616
 617                 final_component = ".";
 618         } else {
 619                 ok = parent_dirname(talloc_tos(),
 620                                     smb_fname->base_name,
 621                                     &parent_dir,
 622                                     &final_component);
 623                 if (!ok) {
 624                         saved_errno = errno;
 625                         goto out;
 626                 }
 627         }
 628
 629         parent_dir_fname = (struct smb_filename) { .base_name = parent_dir };
 630
 631         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
 632         if (oldwd_fname == NULL) {
 633                 goto out;
 634         }
 635
 636         /* Pin parent directory in place. */
 637         if (vfs_ChDir(conn, &parent_dir_fname) == -1) {
 638                 goto out;
 639         }
 640
 641         smb_fname_rel = synthetic_smb_fname(talloc_tos(),
 642                                 final_component,
 643                                 smb_fname->stream_name,
 644                                 &smb_fname->st,
 645                                 smb_fname->flags);
 646         if (smb_fname_rel == NULL) {
 647                 saved_errno = ENOMEM;
 648                 goto out;
 649         }
 650
 651         /* Ensure the relative path is below the share. */
 652         status = check_reduced_name(conn, &parent_dir_fname, smb_fname_rel);
 653         if (!NT_STATUS_IS_OK(status)) {
 654                 saved_errno = map_errno_from_nt_status(status);
 655                 goto out;
 656         }
 657
 658         flags |= O_NOFOLLOW;
 659
 660         {
 661                 struct smb_filename *tmp_name = fsp->fsp_name;
 662                 fsp->fsp_name = smb_fname_rel;
 663                 fd = SMB_VFS_OPEN(conn, smb_fname_rel, fsp, flags, mode);
 664                 fsp->fsp_name = tmp_name;
 665         }
 666
 667         if (fd == -1) {
 668                 saved_errno = link_errno_convert(errno);
 669                 /*
 670                  * Trying to open a symlink to a directory with O_NOFOLLOW and
 671                  * O_DIRECTORY can return either of ELOOP and ENOTDIR. So
 672                  * ENOTDIR really means: might be a symlink, but we're not sure.
 673                  * In this case, we just assume there's a symlink. If we were
 674                  * wrong, process_symlink_open() will return EINVAL. We check
 675                  * this below, and fall back to returning the initial
 676                  * saved_errno.
 677                  *
 678                  * BUG: https://bugzilla.samba.org/show_bug.cgi?id=12860
 679                  */
 680                 if (saved_errno == ELOOP || saved_errno == ENOTDIR) {
 681                         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
 682                                 /* Never follow symlinks on posix open. */
 683                                 goto out;
 684                         }
 685                         if (!lp_follow_symlinks(SNUM(conn))) {
 686                                 /* Explicitly no symlinks. */
 687                                 goto out;
 688                         }
 689                         /*
 690                          * We may have a symlink. Follow in userspace
 691                          * to ensure it's under the share definition.
 692                          */
 693                         fd = process_symlink_open(conn,
 694                                         conn_rootdir_fname,
 695                                         fsp,
 696                                         smb_fname_rel,
 697                                         flags,
 698                                         mode,
 699                                         link_depth);
 700                         if (fd == -1) {
 701                                 if (saved_errno == ENOTDIR &&
 702                                                 errno == EINVAL) {
 703                                         /*
 704                                          * O_DIRECTORY on neither a directory,
 705                                          * nor a symlink. Just return
 706                                          * saved_errno from initial open()
 707                                          */
 708                                         goto out;
 709                                 }
 710                                 saved_errno =
 711                                         link_errno_convert(errno);
 712                         }
 713                 }
 714         }
 715
 716   out:
 717
 718         TALLOC_FREE(parent_dir);
 719         TALLOC_FREE(smb_fname_rel);
 720
 721         if (oldwd_fname != NULL) {
 722                 int ret = vfs_ChDir(conn, oldwd_fname);
 723                 if (ret == -1) {
 724                         smb_panic("unable to get back to old directory\n");
 725                 }
 726                 TALLOC_FREE(oldwd_fname);
 727         }
 728         if (saved_errno != 0) {
 729                 errno = saved_errno;
 730         }
 731         return fd;
 732 }
 733
 734 /****************************************************************************
 735  fd support routines - attempt to do a dos_open.
 736 ****************************************************************************/
 737
 738 NTSTATUS fd_open(struct connection_struct *conn,
 739                  files_struct *fsp,
 740                  int flags,
 741                  mode_t mode)
 742 {
 743         struct smb_filename *smb_fname = fsp->fsp_name;
 744         NTSTATUS status = NT_STATUS_OK;
 745
 746         /*
 747          * Never follow symlinks on a POSIX client. The
 748          * client should be doing this.
 749          */
 750
 751         if ((fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) || !lp_follow_symlinks(SNUM(conn))) {
 752                 flags |= O_NOFOLLOW;
 753         }
 754
 755         /* Ensure path is below share definition. */
 756         if (!lp_widelinks(SNUM(conn))) {
 757                 struct smb_filename *conn_rootdir_fname = NULL;
 758                 const char *conn_rootdir = SMB_VFS_CONNECTPATH(conn,
 759                                                 smb_fname);
 760                 int saved_errno = 0;
 761
 762                 if (conn_rootdir == NULL) {
 763                         return NT_STATUS_NO_MEMORY;
 764                 }
 765                 conn_rootdir_fname = synthetic_smb_fname(talloc_tos(),
 766                                                 conn_rootdir,
 767                                                 NULL,
 768                                                 NULL,
 769                                                 0);
 770                 if (conn_rootdir_fname == NULL) {
 771                         return NT_STATUS_NO_MEMORY;
 772                 }
 773
 774                 /*
 775                  * Only follow symlinks within a share
 776                  * definition.
 777                  */
 778                 fsp->fh->fd = non_widelink_open(conn,
 779                                         conn_rootdir_fname,
 780                                         fsp,
 781                                         smb_fname,
 782                                         flags,
 783                                         mode,
 784                                         0);
 785                 if (fsp->fh->fd == -1) {
 786                         saved_errno = errno;
 787                 }
 788                 TALLOC_FREE(conn_rootdir_fname);
 789                 if (saved_errno != 0) {
 790                         errno = saved_errno;
 791                 }
 792         } else {
 793                 fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 794         }
 795
 796         if (fsp->fh->fd == -1) {
 797                 int posix_errno = link_errno_convert(errno);
 798                 status = map_nt_error_from_unix(posix_errno);
 799                 if (errno == EMFILE) {
 800                         static time_t last_warned = 0L;
 801
 802                         if (time((time_t *) NULL) > last_warned) {
 803                                 DEBUG(0,("Too many open files, unable "
 804                                         "to open more!  smbd's max "
 805                                         "open files = %d\n",
 806                                         lp_max_open_files()));
 807                                 last_warned = time((time_t *) NULL);
 808                         }
 809                 }
 810
 811         }
 812
 813         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 814                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 815                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 816
 817         return status;
 818 }
 819
 820 /****************************************************************************
 821  Close the file associated with a fsp.
 822 ****************************************************************************/
 823
 824 NTSTATUS fd_close(files_struct *fsp)
 825 {
 826         int ret;
 827
 828         if (fsp->dptr) {
 829                 dptr_CloseDir(fsp);
 830         }
 831         if (fsp->fh->fd == -1) {
 832                 return NT_STATUS_OK; /* What we used to call a stat open. */
 833         }
 834         if (fsp->fh->ref_count > 1) {
 835                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 836         }
 837
 838         ret = SMB_VFS_CLOSE(fsp);
 839         fsp->fh->fd = -1;
 840         if (ret == -1) {
 841                 return map_nt_error_from_unix(errno);
 842         }
 843         return NT_STATUS_OK;
 844 }
 845
 846 /****************************************************************************
 847  Change the ownership of a file to that of the parent directory.
 848  Do this by fd if possible.
 849 ****************************************************************************/
 850
 851 void change_file_owner_to_parent(connection_struct *conn,
 852                                         const char *inherit_from_dir,
 853                                         files_struct *fsp)
 854 {
 855         struct smb_filename *smb_fname_parent;
 856         int ret;
 857
 858         smb_fname_parent = synthetic_smb_fname(talloc_tos(),
 859                                         inherit_from_dir,
 860                                         NULL,
 861                                         NULL,
 862                                         0);
 863         if (smb_fname_parent == NULL) {
 864                 return;
 865         }
 866
 867         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 868         if (ret == -1) {
 869                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 870                          "directory %s. Error was %s\n",
 871                          smb_fname_str_dbg(smb_fname_parent),
 872                          strerror(errno)));
 873                 TALLOC_FREE(smb_fname_parent);
 874                 return;
 875         }
 876
 877         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 878                 /* Already this uid - no need to change. */
 879                 DEBUG(10,("change_file_owner_to_parent: file %s "
 880                         "is already owned by uid %d\n",
 881                         fsp_str_dbg(fsp),
 882                         (int)fsp->fsp_name->st.st_ex_uid ));
 883                 TALLOC_FREE(smb_fname_parent);
 884                 return;
 885         }
 886
 887         become_root();
 888         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 889         unbecome_root();
 890         if (ret == -1) {
 891                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 892                          "file %s to parent directory uid %u. Error "
 893                          "was %s\n", fsp_str_dbg(fsp),
 894                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 895                          strerror(errno) ));
 896         } else {
 897                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 898                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 899                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 900                 /* Ensure the uid entry is updated. */
 901                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 902         }
 903
 904         TALLOC_FREE(smb_fname_parent);
 905 }
 906
 907 static NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 908                                         const char *inherit_from_dir,
 909                                         struct smb_filename *smb_dname,
 910                                         SMB_STRUCT_STAT *psbuf)
 911 {
 912         struct smb_filename *smb_fname_parent;
 913         struct smb_filename *smb_fname_cwd = NULL;
 914         struct smb_filename *saved_dir_fname = NULL;
 915         TALLOC_CTX *ctx = talloc_tos();
 916         NTSTATUS status = NT_STATUS_OK;
 917         int ret;
 918
 919         smb_fname_parent = synthetic_smb_fname(ctx,
 920                                         inherit_from_dir,
 921                                         NULL,
 922                                         NULL,
 923                                         0);
 924         if (smb_fname_parent == NULL) {
 925                 return NT_STATUS_NO_MEMORY;
 926         }
 927
 928         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 929         if (ret == -1) {
 930                 status = map_nt_error_from_unix(errno);
 931                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 932                          "directory %s. Error was %s\n",
 933                          smb_fname_str_dbg(smb_fname_parent),
 934                          strerror(errno)));
 935                 goto out;
 936         }
 937
 938         /* We've already done an lstat into psbuf, and we know it's a
 939            directory. If we can cd into the directory and the dev/ino
 940            are the same then we can safely chown without races as
 941            we're locking the directory in place by being in it.  This
 942            should work on any UNIX (thanks tridge :-). JRA.
 943         */
 944
 945         saved_dir_fname = vfs_GetWd(ctx,conn);
 946         if (!saved_dir_fname) {
 947                 status = map_nt_error_from_unix(errno);
 948                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 949                          "current working directory. Error was %s\n",
 950                          strerror(errno)));
 951                 goto out;
 952         }
 953
 954         /* Chdir into the new path. */
 955         if (vfs_ChDir(conn, smb_dname) == -1) {
 956                 status = map_nt_error_from_unix(errno);
 957                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 958                          "current working directory to %s. Error "
 959                          "was %s\n", smb_dname->base_name, strerror(errno) ));
 960                 goto chdir;
 961         }
 962
 963         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL, 0);
 964         if (smb_fname_cwd == NULL) {
 965                 status = NT_STATUS_NO_MEMORY;
 966                 goto chdir;
 967         }
 968
 969         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 970         if (ret == -1) {
 971                 status = map_nt_error_from_unix(errno);
 972                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 973                          "directory '.' (%s) Error was %s\n",
 974                          smb_dname->base_name, strerror(errno)));
 975                 goto chdir;
 976         }
 977
 978         /* Ensure we're pointing at the same place. */
 979         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 980             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 981                 DEBUG(0,("change_dir_owner_to_parent: "
 982                          "device/inode on directory %s changed. "
 983                          "Refusing to chown !\n",
 984                         smb_dname->base_name ));
 985                 status = NT_STATUS_ACCESS_DENIED;
 986                 goto chdir;
 987         }
 988
 989         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 990                 /* Already this uid - no need to change. */
 991                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 992                         "is already owned by uid %d\n",
 993                         smb_dname->base_name,
 994                         (int)smb_fname_cwd->st.st_ex_uid ));
 995                 status = NT_STATUS_OK;
 996                 goto chdir;
 997         }
 998
 999         become_root();
1000         ret = SMB_VFS_LCHOWN(conn,
1001                         smb_fname_cwd,
1002                         smb_fname_parent->st.st_ex_uid,
1003                         (gid_t)-1);
1004         unbecome_root();
1005         if (ret == -1) {
1006                 status = map_nt_error_from_unix(errno);
1007                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
1008                           "directory %s to parent directory uid %u. "
1009                           "Error was %s\n",
1010                           smb_dname->base_name,
1011                           (unsigned int)smb_fname_parent->st.st_ex_uid,
1012                           strerror(errno) ));
1013         } else {
1014                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
1015                         "directory %s to parent directory uid %u.\n",
1016                         smb_dname->base_name,
1017                         (unsigned int)smb_fname_parent->st.st_ex_uid ));
1018                 /* Ensure the uid entry is updated. */
1019                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
1020         }
1021
1022  chdir:
1023         vfs_ChDir(conn, saved_dir_fname);
1024  out:
1025         TALLOC_FREE(saved_dir_fname);
1026         TALLOC_FREE(smb_fname_parent);
1027         TALLOC_FREE(smb_fname_cwd);
1028         return status;
1029 }
1030
1031 /****************************************************************************
1032  Open a file - returning a guaranteed ATOMIC indication of if the
1033  file was created or not.
1034 ****************************************************************************/
1035
1036 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
1037                         files_struct *fsp,
1038                         int flags,
1039                         mode_t mode,
1040                         bool *file_created)
1041 {
1042         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
1043         NTSTATUS retry_status;
1044         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1045         int curr_flags;
1046
1047         *file_created = false;
1048
1049         if (!(flags & O_CREAT)) {
1050                 /*
1051                  * We're not creating the file, just pass through.
1052                  */
1053                 return fd_open(conn, fsp, flags, mode);
1054         }
1055
1056         if (flags & O_EXCL) {
1057                 /*
1058                  * Fail if already exists, just pass through.
1059                  */
1060                 status = fd_open(conn, fsp, flags, mode);
1061
1062                 /*
1063                  * Here we've opened with O_CREAT|O_EXCL. If that went
1064                  * NT_STATUS_OK, we *know* we created this file.
1065                  */
1066                 *file_created = NT_STATUS_IS_OK(status);
1067
1068                 return status;
1069         }
1070
1071         /*
1072          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
1073          * To know absolutely if we created the file or not,
1074          * we can never call O_CREAT without O_EXCL. So if
1075          * we think the file existed, try without O_CREAT|O_EXCL.
1076          * If we think the file didn't exist, try with
1077          * O_CREAT|O_EXCL.
1078          *
1079          * The big problem here is dangling symlinks. Opening
1080          * without O_NOFOLLOW means both bad symlink
1081          * and missing path return -1, ENOENT from open(). As POSIX
1082          * is pathname based it's not possible to tell
1083          * the difference between these two cases in a
1084          * non-racy way, so change to try only two attempts before
1085          * giving up.
1086          *
1087          * We don't have this problem for the O_NOFOLLOW
1088          * case as it just returns NT_STATUS_OBJECT_PATH_NOT_FOUND
1089          * mapped from the ELOOP POSIX error.
1090          */
1091
1092         curr_flags = flags;
1093
1094         if (file_existed) {
1095                 curr_flags &= ~(O_CREAT);
1096                 retry_status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
1097         } else {
1098                 curr_flags |= O_EXCL;
1099                 retry_status = NT_STATUS_OBJECT_NAME_COLLISION;
1100         }
1101
1102         status = fd_open(conn, fsp, curr_flags, mode);
1103         if (NT_STATUS_IS_OK(status)) {
1104                 if (!file_existed) {
1105                         *file_created = true;
1106                 }
1107                 return NT_STATUS_OK;
1108         }
1109         if (!NT_STATUS_EQUAL(status, retry_status)) {
1110                 return status;
1111         }
1112
1113         curr_flags = flags;
1114
1115         /*
1116          * Keep file_existed up to date for clarity.
1117          */
1118         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1119                 file_existed = false;
1120                 curr_flags |= O_EXCL;
1121                 DBG_DEBUG("file %s did not exist. Retry.\n",
1122                         smb_fname_str_dbg(fsp->fsp_name));
1123         } else {
1124                 file_existed = true;
1125                 curr_flags &= ~(O_CREAT);
1126                 DBG_DEBUG("file %s existed. Retry.\n",
1127                         smb_fname_str_dbg(fsp->fsp_name));
1128         }
1129
1130         status = fd_open(conn, fsp, curr_flags, mode);
1131
1132         if (NT_STATUS_IS_OK(status) && (!file_existed)) {
1133                 *file_created = true;
1134         }
1135
1136         return status;
1137 }
1138
1139 /****************************************************************************
1140  Open a file.
1141 ****************************************************************************/
1142
1143 static NTSTATUS open_file(files_struct *fsp,
1144                           connection_struct *conn,
1145                           struct smb_request *req,
1146                           const char *parent_dir,
1147                           int flags,
1148                           mode_t unx_mode,
1149                           uint32_t access_mask, /* client requested access mask. */
1150                           uint32_t open_access_mask, /* what we're actually using in the open. */
1151                           bool *p_file_created)
1152 {
1153         struct smb_filename *smb_fname = fsp->fsp_name;
1154         NTSTATUS status = NT_STATUS_OK;
1155         int accmode = (flags & O_ACCMODE);
1156         int local_flags = flags;
1157         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1158
1159         fsp->fh->fd = -1;
1160         errno = EPERM;
1161
1162         /* Check permissions */
1163
1164         /*
1165          * This code was changed after seeing a client open request
1166          * containing the open mode of (DENY_WRITE/read-only) with
1167          * the 'create if not exist' bit set. The previous code
1168          * would fail to open the file read only on a read-only share
1169          * as it was checking the flags parameter  directly against O_RDONLY,
1170          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
1171          * JRA.
1172          */
1173
1174         if (!CAN_WRITE(conn)) {
1175                 /* It's a read-only share - fail if we wanted to write. */
1176                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
1177                         DEBUG(3,("Permission denied opening %s\n",
1178                                  smb_fname_str_dbg(smb_fname)));
1179                         return NT_STATUS_ACCESS_DENIED;
1180                 }
1181                 if (flags & O_CREAT) {
1182                         /* We don't want to write - but we must make sure that
1183                            O_CREAT doesn't create the file if we have write
1184                            access into the directory.
1185                         */
1186                         flags &= ~(O_CREAT|O_EXCL);
1187                         local_flags &= ~(O_CREAT|O_EXCL);
1188                 }
1189         }
1190
1191         /*
1192          * This little piece of insanity is inspired by the
1193          * fact that an NT client can open a file for O_RDONLY,
1194          * but set the create disposition to FILE_EXISTS_TRUNCATE.
1195          * If the client *can* write to the file, then it expects to
1196          * truncate the file, even though it is opening for readonly.
1197          * Quicken uses this stupid trick in backup file creation...
1198          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
1199          * for helping track this one down. It didn't bite us in 2.0.x
1200          * as we always opened files read-write in that release. JRA.
1201          */
1202
1203         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
1204                 DEBUG(10,("open_file: truncate requested on read-only open "
1205                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
1206                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
1207         }
1208
1209         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
1210             (!file_existed && (local_flags & O_CREAT)) ||
1211             ((local_flags & O_TRUNC) == O_TRUNC) ) {
1212                 const char *wild;
1213                 int ret;
1214
1215 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
1216                 /*
1217                  * We would block on opening a FIFO with no one else on the
1218                  * other end. Do what we used to do and add O_NONBLOCK to the
1219                  * open flags. JRA.
1220                  */
1221
1222                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
1223                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
1224                         local_flags |= O_NONBLOCK;
1225                 }
1226 #endif
1227
1228                 /* Don't create files with Microsoft wildcard characters. */
1229                 if (fsp->base_fsp) {
1230                         /*
1231                          * wildcard characters are allowed in stream names
1232                          * only test the basefilename
1233                          */
1234                         wild = fsp->base_fsp->fsp_name->base_name;
1235                 } else {
1236                         wild = smb_fname->base_name;
1237                 }
1238                 if ((local_flags & O_CREAT) && !file_existed &&
1239                     !(fsp->posix_flags & FSP_POSIX_FLAGS_PATHNAMES) &&
1240                     ms_has_wild(wild))  {
1241                         return NT_STATUS_OBJECT_NAME_INVALID;
1242                 }
1243
1244                 /* Can we access this file ? */
1245                 if (!fsp->base_fsp) {
1246                         /* Only do this check on non-stream open. */
1247                         if (file_existed) {
1248                                 status = smbd_check_access_rights(conn,
1249                                                 smb_fname,
1250                                                 false,
1251                                                 access_mask);
1252
1253                                 if (!NT_STATUS_IS_OK(status)) {
1254                                         DEBUG(10, ("open_file: "
1255                                                    "smbd_check_access_rights "
1256                                                    "on file %s returned %s\n",
1257                                                    smb_fname_str_dbg(smb_fname),
1258                                                    nt_errstr(status)));
1259                                 }
1260
1261                                 if (!NT_STATUS_IS_OK(status) &&
1262                                     !NT_STATUS_EQUAL(status,
1263                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1264                                 {
1265                                         return status;
1266                                 }
1267
1268                                 if (NT_STATUS_EQUAL(status,
1269                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1270                                 {
1271                                         DEBUG(10, ("open_file: "
1272                                                 "file %s vanished since we "
1273                                                 "checked for existence.\n",
1274                                                 smb_fname_str_dbg(smb_fname)));
1275                                         file_existed = false;
1276                                         SET_STAT_INVALID(fsp->fsp_name->st);
1277                                 }
1278                         }
1279
1280                         if (!file_existed) {
1281                                 if (!(local_flags & O_CREAT)) {
1282                                         /* File didn't exist and no O_CREAT. */
1283                                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1284                                 }
1285
1286                                 status = check_parent_access(conn,
1287                                                              smb_fname,
1288                                                              SEC_DIR_ADD_FILE);
1289                                 if (!NT_STATUS_IS_OK(status)) {
1290                                         DEBUG(10, ("open_file: "
1291                                                    "check_parent_access on "
1292                                                    "file %s returned %s\n",
1293                                                    smb_fname_str_dbg(smb_fname),
1294                                                    nt_errstr(status) ));
1295                                         return status;
1296                                 }
1297                         }
1298                 }
1299
1300                 /*
1301                  * Actually do the open - if O_TRUNC is needed handle it
1302                  * below under the share mode lock.
1303                  */
1304                 status = fd_open_atomic(conn, fsp, local_flags & ~O_TRUNC,
1305                                 unx_mode, p_file_created);
1306                 if (!NT_STATUS_IS_OK(status)) {
1307                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
1308                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
1309                                  nt_errstr(status),local_flags,flags));
1310                         return status;
1311                 }
1312
1313                 if (local_flags & O_NONBLOCK) {
1314                         /*
1315                          * GPFS can return ETIMEDOUT for pread on
1316                          * nonblocking file descriptors when files
1317                          * migrated to tape need to be recalled. I
1318                          * could imagine this happens elsehwere
1319                          * too. With blocking file descriptors this
1320                          * does not happen.
1321                          */
1322                         ret = set_blocking(fsp->fh->fd, true);
1323                         if (ret == -1) {
1324                                 status = map_nt_error_from_unix(errno);
1325                                 DBG_WARNING("Could not set fd to blocking: "
1326                                             "%s\n", strerror(errno));
1327                                 fd_close(fsp);
1328                                 return status;
1329                         }
1330                 }
1331
1332                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1333                 if (ret == -1) {
1334                         /* If we have an fd, this stat should succeed. */
1335                         DEBUG(0,("Error doing fstat on open file %s "
1336                                 "(%s)\n",
1337                                 smb_fname_str_dbg(smb_fname),
1338                                 strerror(errno) ));
1339                         status = map_nt_error_from_unix(errno);
1340                         fd_close(fsp);
1341                         return status;
1342                 }
1343
1344                 if (*p_file_created) {
1345                         /* We created this file. */
1346
1347                         bool need_re_stat = false;
1348                         /* Do all inheritance work after we've
1349                            done a successful fstat call and filled
1350                            in the stat struct in fsp->fsp_name. */
1351
1352                         /* Inherit the ACL if required */
1353                         if (lp_inherit_permissions(SNUM(conn))) {
1354                                 inherit_access_posix_acl(conn, parent_dir,
1355                                                          smb_fname,
1356                                                          unx_mode);
1357                                 need_re_stat = true;
1358                         }
1359
1360                         /* Change the owner if required. */
1361                         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
1362                                 change_file_owner_to_parent(conn, parent_dir,
1363                                                             fsp);
1364                                 need_re_stat = true;
1365                         }
1366
1367                         if (need_re_stat) {
1368                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1369                                 /* If we have an fd, this stat should succeed. */
1370                                 if (ret == -1) {
1371                                         DEBUG(0,("Error doing fstat on open file %s "
1372                                                  "(%s)\n",
1373                                                  smb_fname_str_dbg(smb_fname),
1374                                                  strerror(errno) ));
1375                                 }
1376                         }
1377
1378                         notify_fname(conn, NOTIFY_ACTION_ADDED,
1379                                      FILE_NOTIFY_CHANGE_FILE_NAME,
1380                                      smb_fname->base_name);
1381                 }
1382         } else {
1383                 fsp->fh->fd = -1; /* What we used to call a stat open. */
1384                 if (!file_existed) {
1385                         /* File must exist for a stat open. */
1386                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1387                 }
1388
1389                 status = smbd_check_access_rights(conn,
1390                                 smb_fname,
1391                                 false,
1392                                 access_mask);
1393
1394                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1395                                 (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) &&
1396                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
1397                         /* This is a POSIX stat open for delete
1398                          * or rename on a symlink that points
1399                          * nowhere. Allow. */
1400                         DEBUG(10,("open_file: allowing POSIX "
1401                                   "open on bad symlink %s\n",
1402                                   smb_fname_str_dbg(smb_fname)));
1403                         status = NT_STATUS_OK;
1404                 }
1405
1406                 if (!NT_STATUS_IS_OK(status)) {
1407                         DEBUG(10,("open_file: "
1408                                 "smbd_check_access_rights on file "
1409                                 "%s returned %s\n",
1410                                 smb_fname_str_dbg(smb_fname),
1411                                 nt_errstr(status) ));
1412                         return status;
1413                 }
1414         }
1415
1416         /*
1417          * POSIX allows read-only opens of directories. We don't
1418          * want to do this (we use a different code path for this)
1419          * so catch a directory open and return an EISDIR. JRA.
1420          */
1421
1422         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
1423                 fd_close(fsp);
1424                 errno = EISDIR;
1425                 return NT_STATUS_FILE_IS_A_DIRECTORY;
1426         }
1427
1428         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
1429         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
1430         fsp->file_pid = req ? req->smbpid : 0;
1431         fsp->can_lock = True;
1432         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
1433         fsp->can_write =
1434                 CAN_WRITE(conn) &&
1435                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
1436         fsp->print_file = NULL;
1437         fsp->modified = False;
1438         fsp->sent_oplock_break = NO_BREAK_SENT;
1439         fsp->is_directory = False;
1440         if (conn->aio_write_behind_list &&
1441             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
1442                        conn->case_sensitive)) {
1443                 fsp->aio_write_behind = True;
1444         }
1445
1446         fsp->wcp = NULL; /* Write cache pointer. */
1447
1448         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
1449                  conn->session_info->unix_info->unix_name,
1450                  smb_fname_str_dbg(smb_fname),
1451                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
1452                  conn->num_files_open));
1453
1454         errno = 0;
1455         return NT_STATUS_OK;
1456 }
1457
1458 /****************************************************************************
1459  Check if we can open a file with a share mode.
1460  Returns True if conflict, False if not.
1461 ****************************************************************************/
1462
1463 static bool share_conflict(struct share_mode_entry *entry,
1464                            uint32_t access_mask,
1465                            uint32_t share_access)
1466 {
1467         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
1468                   "entry->share_access = 0x%x, "
1469                   "entry->private_options = 0x%x\n",
1470                   (unsigned int)entry->access_mask,
1471                   (unsigned int)entry->share_access,
1472                   (unsigned int)entry->private_options));
1473
1474         if (server_id_is_disconnected(&entry->pid)) {
1475                 return false;
1476         }
1477
1478         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
1479                   (unsigned int)access_mask, (unsigned int)share_access));
1480
1481         if ((entry->access_mask & (FILE_WRITE_DATA|
1482                                    FILE_APPEND_DATA|
1483                                    FILE_READ_DATA|
1484                                    FILE_EXECUTE|
1485                                    DELETE_ACCESS)) == 0) {
1486                 DEBUG(10,("share_conflict: No conflict due to "
1487                           "entry->access_mask = 0x%x\n",
1488                           (unsigned int)entry->access_mask ));
1489                 return False;
1490         }
1491
1492         if ((access_mask & (FILE_WRITE_DATA|
1493                             FILE_APPEND_DATA|
1494                             FILE_READ_DATA|
1495                             FILE_EXECUTE|
1496                             DELETE_ACCESS)) == 0) {
1497                 DEBUG(10,("share_conflict: No conflict due to "
1498                           "access_mask = 0x%x\n",
1499                           (unsigned int)access_mask ));
1500                 return False;
1501         }
1502
1503 #if 1 /* JRA TEST - Superdebug. */
1504 #define CHECK_MASK(num, am, right, sa, share) \
1505         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
1506                 (unsigned int)(num), (unsigned int)(am), \
1507                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
1508         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
1509                 (unsigned int)(num), (unsigned int)(sa), \
1510                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
1511         if (((am) & (right)) && !((sa) & (share))) { \
1512                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1513 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1514                         (unsigned int)(share) )); \
1515                 return True; \
1516         }
1517 #else
1518 #define CHECK_MASK(num, am, right, sa, share) \
1519         if (((am) & (right)) && !((sa) & (share))) { \
1520                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1521 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1522                         (unsigned int)(share) )); \
1523                 return True; \
1524         }
1525 #endif
1526
1527         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1528                    share_access, FILE_SHARE_WRITE);
1529         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1530                    entry->share_access, FILE_SHARE_WRITE);
1531
1532         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1533                    share_access, FILE_SHARE_READ);
1534         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1535                    entry->share_access, FILE_SHARE_READ);
1536
1537         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1538                    share_access, FILE_SHARE_DELETE);
1539         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1540                    entry->share_access, FILE_SHARE_DELETE);
1541
1542         DEBUG(10,("share_conflict: No conflict.\n"));
1543         return False;
1544 }
1545
1546 #if defined(DEVELOPER)
1547 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1548                                       const struct file_id id,
1549                                       int num,
1550                                       struct share_mode_entry *share_entry)
1551 {
1552         struct server_id self = messaging_server_id(sconn->msg_ctx);
1553         files_struct *fsp;
1554
1555         if (!serverid_equal(&self, &share_entry->pid)) {
1556                 return;
1557         }
1558
1559         if (share_entry->op_mid == 0) {
1560                 /* INTERNAL_OPEN_ONLY */
1561                 return;
1562         }
1563
1564         if (!is_valid_share_mode_entry(share_entry)) {
1565                 return;
1566         }
1567
1568         fsp = file_find_dif(sconn, id, share_entry->share_file_id);
1569         if (!fsp) {
1570                 DBG_ERR("PANIC : %s\n",
1571                         share_mode_str(talloc_tos(), num, &id,
1572                                        share_entry));
1573                 smb_panic("validate_my_share_entries: Cannot match a "
1574                           "share entry with an open file\n");
1575         }
1576
1577         if (((uint16_t)fsp->oplock_type) != share_entry->op_type) {
1578                 goto panic;
1579         }
1580
1581         return;
1582
1583  panic:
1584         {
1585                 char *str;
1586                 DBG_ERR("validate_my_share_entries: PANIC : %s\n",
1587                         share_mode_str(talloc_tos(), num, &id,
1588                                        share_entry));
1589                 str = talloc_asprintf(talloc_tos(),
1590                         "validate_my_share_entries: "
1591                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1592                          fsp->fsp_name->base_name,
1593                          (unsigned int)fsp->oplock_type,
1594                          (unsigned int)share_entry->op_type );
1595                 smb_panic(str);
1596         }
1597 }
1598 #endif
1599
1600 bool is_stat_open(uint32_t access_mask)
1601 {
1602         const uint32_t stat_open_bits =
1603                 (SYNCHRONIZE_ACCESS|
1604                  FILE_READ_ATTRIBUTES|
1605                  FILE_WRITE_ATTRIBUTES);
1606
1607         return (((access_mask &  stat_open_bits) != 0) &&
1608                 ((access_mask & ~stat_open_bits) == 0));
1609 }
1610
1611 static bool has_delete_on_close(struct share_mode_lock *lck,
1612                                 uint32_t name_hash)
1613 {
1614         struct share_mode_data *d = lck->data;
1615         uint32_t i;
1616
1617         if (d->num_share_modes == 0) {
1618                 return false;
1619         }
1620         if (!is_delete_on_close_set(lck, name_hash)) {
1621                 return false;
1622         }
1623         for (i=0; i<d->num_share_modes; i++) {
1624                 if (!share_mode_stale_pid(d, i)) {
1625                         return true;
1626                 }
1627         }
1628         return false;
1629 }
1630
1631 /****************************************************************************
1632  Deal with share modes
1633  Invariant: Share mode must be locked on entry and exit.
1634  Returns -1 on error, or number of share modes on success (may be zero).
1635 ****************************************************************************/
1636
1637 static NTSTATUS open_mode_check(connection_struct *conn,
1638                                 struct share_mode_lock *lck,
1639                                 uint32_t access_mask,
1640                                 uint32_t share_access)
1641 {
1642         uint32_t i;
1643
1644         if(lck->data->num_share_modes == 0) {
1645                 return NT_STATUS_OK;
1646         }
1647
1648         if (is_stat_open(access_mask)) {
1649                 /* Stat open that doesn't trigger oplock breaks or share mode
1650                  * checks... ! JRA. */
1651                 return NT_STATUS_OK;
1652         }
1653
1654         /*
1655          * Check if the share modes will give us access.
1656          */
1657
1658 #if defined(DEVELOPER)
1659         for(i = 0; i < lck->data->num_share_modes; i++) {
1660                 validate_my_share_entries(conn->sconn, lck->data->id, i,
1661                                           &lck->data->share_modes[i]);
1662         }
1663 #endif
1664
1665         /* Now we check the share modes, after any oplock breaks. */
1666         for(i = 0; i < lck->data->num_share_modes; i++) {
1667
1668                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1669                         continue;
1670                 }
1671
1672                 /* someone else has a share lock on it, check to see if we can
1673                  * too */
1674                 if (share_conflict(&lck->data->share_modes[i],
1675                                    access_mask, share_access)) {
1676
1677                         if (share_mode_stale_pid(lck->data, i)) {
1678                                 continue;
1679                         }
1680
1681                         return NT_STATUS_SHARING_VIOLATION;
1682                 }
1683         }
1684
1685         return NT_STATUS_OK;
1686 }
1687
1688 /*
1689  * Send a break message to the oplock holder and delay the open for
1690  * our client.
1691  */
1692
1693 NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1694                             const struct file_id *id,
1695                             const struct share_mode_entry *exclusive,
1696                             uint16_t break_to)
1697 {
1698         struct oplock_break_message msg = {
1699                 .id = *id,
1700                 .share_file_id = exclusive->share_file_id,
1701                 .break_to = break_to,
1702         };
1703         enum ndr_err_code ndr_err;
1704         DATA_BLOB blob;
1705         NTSTATUS status;
1706
1707         if (DEBUGLVL(10)) {
1708                 struct server_id_buf buf;
1709                 DBG_DEBUG("Sending break message to %s\n",
1710                           server_id_str_buf(exclusive->pid, &buf));
1711                 NDR_PRINT_DEBUG(oplock_break_message, &msg);
1712         }
1713
1714         ndr_err = ndr_push_struct_blob(
1715                 &blob,
1716                 talloc_tos(),
1717                 &msg,
1718                 (ndr_push_flags_fn_t)ndr_push_oplock_break_message);
1719         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1720                 DBG_WARNING("ndr_push_oplock_break_message failed: %s\n",
1721                             ndr_errstr(ndr_err));
1722                 return ndr_map_error2ntstatus(ndr_err);
1723         }
1724
1725         status = messaging_send(
1726                 msg_ctx, exclusive->pid, MSG_SMB_BREAK_REQUEST, &blob);
1727         TALLOC_FREE(blob.data);
1728         if (!NT_STATUS_IS_OK(status)) {
1729                 DEBUG(3, ("Could not send oplock break message: %s\n",
1730                           nt_errstr(status)));
1731         }
1732
1733         return status;
1734 }
1735
1736 /*
1737  * Do internal consistency checks on the share mode for a file.
1738  */
1739
1740 static bool validate_oplock_types(struct share_mode_lock *lck)
1741 {
1742         struct share_mode_data *d = lck->data;
1743         bool batch = false;
1744         bool ex_or_batch = false;
1745         bool level2 = false;
1746         bool no_oplock = false;
1747         uint32_t num_non_stat_opens = 0;
1748         uint32_t i;
1749
1750         for (i=0; i<d->num_share_modes; i++) {
1751                 struct share_mode_entry *e = &d->share_modes[i];
1752
1753                 if (!is_valid_share_mode_entry(e)) {
1754                         continue;
1755                 }
1756
1757                 if (e->op_mid == 0) {
1758                         /* INTERNAL_OPEN_ONLY */
1759                         continue;
1760                 }
1761
1762                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1763                         /* We ignore stat opens in the table - they
1764                            always have NO_OPLOCK and never get or
1765                            cause breaks. JRA. */
1766                         continue;
1767                 }
1768
1769                 num_non_stat_opens += 1;
1770
1771                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1772                         /* batch - can only be one. */
1773                         if (share_mode_stale_pid(d, i)) {
1774                                 DEBUG(10, ("Found stale batch oplock\n"));
1775                                 continue;
1776                         }
1777                         if (ex_or_batch || batch || level2 || no_oplock) {
1778                                 DEBUG(0, ("Bad batch oplock entry %u.",
1779                                           (unsigned)i));
1780                                 return false;
1781                         }
1782                         batch = true;
1783                 }
1784
1785                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1786                         if (share_mode_stale_pid(d, i)) {
1787                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1788                                 continue;
1789                         }
1790                         /* Exclusive or batch - can only be one. */
1791                         if (ex_or_batch || level2 || no_oplock) {
1792                                 DEBUG(0, ("Bad exclusive or batch oplock "
1793                                           "entry %u.", (unsigned)i));
1794                                 return false;
1795                         }
1796                         ex_or_batch = true;
1797                 }
1798
1799                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1800                         if (batch || ex_or_batch) {
1801                                 if (share_mode_stale_pid(d, i)) {
1802                                         DEBUG(10, ("Found stale LevelII "
1803                                                    "oplock\n"));
1804                                         continue;
1805                                 }
1806                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1807                                           (unsigned)i));
1808                                 return false;
1809                         }
1810                         level2 = true;
1811                 }
1812
1813                 if (e->op_type == NO_OPLOCK) {
1814                         if (batch || ex_or_batch) {
1815                                 if (share_mode_stale_pid(d, i)) {
1816                                         DEBUG(10, ("Found stale NO_OPLOCK "
1817                                                    "entry\n"));
1818                                         continue;
1819                                 }
1820                                 DEBUG(0, ("Bad no oplock entry %u.",
1821                                           (unsigned)i));
1822                                 return false;
1823                         }
1824                         no_oplock = true;
1825                 }
1826         }
1827
1828         remove_stale_share_mode_entries(d);
1829
1830         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1831                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1832                           (int)batch, (int)ex_or_batch,
1833                           (int)d->num_share_modes));
1834                 return false;
1835         }
1836
1837         return true;
1838 }
1839
1840 static bool delay_for_oplock(files_struct *fsp,
1841                              int oplock_request,
1842                              const struct smb2_lease *lease,
1843                              struct share_mode_lock *lck,
1844                              bool have_sharing_violation,
1845                              uint32_t create_disposition,
1846                              bool first_open_attempt)
1847 {
1848         struct share_mode_data *d = lck->data;
1849         uint32_t i;
1850         bool delay = false;
1851         bool will_overwrite;
1852
1853         if ((oplock_request & INTERNAL_OPEN_ONLY) ||
1854             is_stat_open(fsp->access_mask)) {
1855                 return false;
1856         }
1857
1858         switch (create_disposition) {
1859         case FILE_SUPERSEDE:
1860         case FILE_OVERWRITE:
1861         case FILE_OVERWRITE_IF:
1862                 will_overwrite = true;
1863                 break;
1864         default:
1865                 will_overwrite = false;
1866                 break;
1867         }
1868
1869         for (i=0; i<d->num_share_modes; i++) {
1870                 struct share_mode_entry *e = &d->share_modes[i];
1871                 bool e_is_lease = (e->op_type == LEASE_OPLOCK);
1872                 uint32_t e_lease_type = get_lease_type(d, e);
1873                 uint32_t break_to;
1874                 uint32_t delay_mask = 0;
1875                 bool lease_is_breaking = false;
1876
1877                 if (e_is_lease) {
1878                         NTSTATUS status;
1879
1880                         if (lease != NULL) {
1881                                 bool our_lease = smb2_lease_equal(
1882                                         fsp_client_guid(fsp),
1883                                         &lease->lease_key,
1884                                         &e->client_guid,
1885                                         &e->lease_key);
1886                                 if (our_lease) {
1887                                         DBG_DEBUG("Ignoring our own lease\n");
1888                                         continue;
1889                                 }
1890                         }
1891
1892                         status = leases_db_get(
1893                                 &e->client_guid,
1894                                 &e->lease_key,
1895                                 &fsp->file_id,
1896                                 NULL, /* current_state */
1897                                 &lease_is_breaking,
1898                                 NULL, /* breaking_to_requested */
1899                                 NULL, /* breaking_to_required */
1900                                 NULL, /* lease_version */
1901                                 NULL); /* epoch */
1902                         SMB_ASSERT(NT_STATUS_IS_OK(status));
1903                 }
1904
1905                 if (have_sharing_violation) {
1906                         delay_mask = SMB2_LEASE_HANDLE;
1907                 } else {
1908                         delay_mask = SMB2_LEASE_WRITE;
1909                 }
1910
1911                 break_to = e_lease_type & ~delay_mask;
1912
1913                 if (will_overwrite) {
1914                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_READ);
1915                 }
1916
1917                 DEBUG(10, ("entry %u: e_lease_type %u, will_overwrite: %u\n",
1918                            (unsigned)i, (unsigned)e_lease_type,
1919                            (unsigned)will_overwrite));
1920
1921                 if ((e_lease_type & ~break_to) == 0) {
1922                         if (lease_is_breaking) {
1923                                 delay = true;
1924                         }
1925                         continue;
1926                 }
1927
1928                 if (share_mode_stale_pid(d, i)) {
1929                         continue;
1930                 }
1931
1932                 if (will_overwrite) {
1933                         /*
1934                          * If we break anyway break to NONE directly.
1935                          * Otherwise vfs_set_filelen() will trigger the
1936                          * break.
1937                          */
1938                         break_to &= ~(SMB2_LEASE_READ|SMB2_LEASE_WRITE);
1939                 }
1940
1941                 if (!e_is_lease) {
1942                         /*
1943                          * Oplocks only support breaking to R or NONE.
1944                          */
1945                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_WRITE);
1946                 }
1947
1948                 DEBUG(10, ("breaking from %d to %d\n",
1949                            (int)e_lease_type, (int)break_to));
1950                 send_break_message(fsp->conn->sconn->msg_ctx, &fsp->file_id,
1951                                    e, break_to);
1952                 if (e_lease_type & delay_mask) {
1953                         delay = true;
1954                 }
1955                 if (lease_is_breaking && !first_open_attempt) {
1956                         delay = true;
1957                 }
1958         }
1959
1960         return delay;
1961 }
1962
1963 static bool file_has_brlocks(files_struct *fsp)
1964 {
1965         struct byte_range_lock *br_lck;
1966
1967         br_lck = brl_get_locks_readonly(fsp);
1968         if (!br_lck)
1969                 return false;
1970
1971         return (brl_num_locks(br_lck) > 0);
1972 }
1973
1974 struct fsp_lease *find_fsp_lease(struct files_struct *new_fsp,
1975                                  const struct smb2_lease_key *key,
1976                                  uint32_t current_state,
1977                                  uint16_t lease_version,
1978                                  uint16_t lease_epoch)
1979 {
1980         struct files_struct *fsp;
1981
1982         /*
1983          * TODO: Measure how expensive this loop is with thousands of open
1984          * handles...
1985          */
1986
1987         for (fsp = file_find_di_first(new_fsp->conn->sconn, new_fsp->file_id);
1988              fsp != NULL;
1989              fsp = file_find_di_next(fsp)) {
1990
1991                 if (fsp == new_fsp) {
1992                         continue;
1993                 }
1994                 if (fsp->oplock_type != LEASE_OPLOCK) {
1995                         continue;
1996                 }
1997                 if (smb2_lease_key_equal(&fsp->lease->lease.lease_key, key)) {
1998                         fsp->lease->ref_count += 1;
1999                         return fsp->lease;
2000                 }
2001         }
2002
2003         /* Not found - must be leased in another smbd. */
2004         new_fsp->lease = talloc_zero(new_fsp->conn->sconn, struct fsp_lease);
2005         if (new_fsp->lease == NULL) {
2006                 return NULL;
2007         }
2008         new_fsp->lease->ref_count = 1;
2009         new_fsp->lease->sconn = new_fsp->conn->sconn;
2010         new_fsp->lease->lease.lease_key = *key;
2011         new_fsp->lease->lease.lease_state = current_state;
2012         /*
2013          * We internally treat all leases as V2 and update
2014          * the epoch, but when sending breaks it matters if
2015          * the requesting lease was v1 or v2.
2016          */
2017         new_fsp->lease->lease.lease_version = lease_version;
2018         new_fsp->lease->lease.lease_epoch = lease_epoch;
2019         return new_fsp->lease;
2020 }
2021
2022 static NTSTATUS try_lease_upgrade(struct files_struct *fsp,
2023                                   struct share_mode_lock *lck,
2024                                   const struct GUID *client_guid,
2025                                   const struct smb2_lease *lease,
2026                                   uint32_t granted)
2027 {
2028         bool do_upgrade;
2029         uint32_t current_state, breaking_to_requested, breaking_to_required;
2030         bool breaking;
2031         uint16_t lease_version, epoch;
2032         uint32_t existing, requested;
2033         NTSTATUS status;
2034
2035         status = leases_db_get(
2036                 client_guid,
2037                 &lease->lease_key,
2038                 &fsp->file_id,
2039                 &current_state,
2040                 &breaking,
2041                 &breaking_to_requested,
2042                 &breaking_to_required,
2043                 &lease_version,
2044                 &epoch);
2045         if (!NT_STATUS_IS_OK(status)) {
2046                 return status;
2047         }
2048
2049         fsp->lease = find_fsp_lease(
2050                 fsp,
2051                 &lease->lease_key,
2052                 current_state,
2053                 lease_version,
2054                 epoch);
2055         if (fsp->lease == NULL) {
2056                 DEBUG(1, ("Did not find existing lease for file %s\n",
2057                           fsp_str_dbg(fsp)));
2058                 return NT_STATUS_NO_MEMORY;
2059         }
2060
2061         /*
2062          * Upgrade only if the requested lease is a strict upgrade.
2063          */
2064         existing = current_state;
2065         requested = lease->lease_state;
2066
2067         /*
2068          * Tricky: This test makes sure that "requested" is a
2069          * strict bitwise superset of "existing".
2070          */
2071         do_upgrade = ((existing & requested) == existing);
2072
2073         /*
2074          * Upgrade only if there's a change.
2075          */
2076         do_upgrade &= (granted != existing);
2077
2078         /*
2079          * Upgrade only if other leases don't prevent what was asked
2080          * for.
2081          */
2082         do_upgrade &= (granted == requested);
2083
2084         /*
2085          * only upgrade if we are not in breaking state
2086          */
2087         do_upgrade &= !breaking;
2088
2089         DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
2090                    "granted=%"PRIu32", do_upgrade=%d\n",
2091                    existing, requested, granted, (int)do_upgrade));
2092
2093         if (do_upgrade) {
2094                 NTSTATUS set_status;
2095
2096                 current_state = granted;
2097                 epoch += 1;
2098
2099                 set_status = leases_db_set(
2100                         client_guid,
2101                         &lease->lease_key,
2102                         current_state,
2103                         breaking,
2104                         breaking_to_requested,
2105                         breaking_to_required,
2106                         lease_version,
2107                         epoch);
2108
2109                 if (!NT_STATUS_IS_OK(set_status)) {
2110                         DBG_DEBUG("leases_db_set failed: %s\n",
2111                                   nt_errstr(set_status));
2112                         return set_status;
2113                 }
2114         }
2115
2116         fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
2117
2118         return NT_STATUS_OK;
2119 }
2120
2121 static NTSTATUS grant_new_fsp_lease(struct files_struct *fsp,
2122                                     struct share_mode_lock *lck,
2123                                     const struct GUID *client_guid,
2124                                     const struct smb2_lease *lease,
2125                                     uint32_t granted)
2126 {
2127         struct share_mode_data *d = lck->data;
2128         NTSTATUS status;
2129
2130         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
2131         if (fsp->lease == NULL) {
2132                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2133         }
2134         fsp->lease->ref_count = 1;
2135         fsp->lease->sconn = fsp->conn->sconn;
2136         fsp->lease->lease.lease_version = lease->lease_version;
2137         fsp->lease->lease.lease_key = lease->lease_key;
2138         fsp->lease->lease.lease_state = granted;
2139         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
2140
2141         status = leases_db_add(client_guid,
2142                                &lease->lease_key,
2143                                &fsp->file_id,
2144                                fsp->lease->lease.lease_state,
2145                                fsp->lease->lease.lease_version,
2146                                fsp->lease->lease.lease_epoch,
2147                                fsp->conn->connectpath,
2148                                fsp->fsp_name->base_name,
2149                                fsp->fsp_name->stream_name);
2150         if (!NT_STATUS_IS_OK(status)) {
2151                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
2152                            nt_errstr(status)));
2153                 TALLOC_FREE(fsp->lease);
2154                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2155         }
2156
2157         d->modified = true;
2158
2159         return NT_STATUS_OK;
2160 }
2161
2162 static NTSTATUS grant_fsp_lease(struct files_struct *fsp,
2163                                 struct share_mode_lock *lck,
2164                                 const struct smb2_lease *lease,
2165                                 uint32_t granted)
2166 {
2167         const struct GUID *client_guid = fsp_client_guid(fsp);
2168         NTSTATUS status;
2169
2170         status = try_lease_upgrade(fsp, lck, client_guid, lease, granted);
2171
2172         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
2173                 status = grant_new_fsp_lease(
2174                         fsp, lck, client_guid, lease, granted);
2175         }
2176
2177         return status;
2178 }
2179
2180 static bool is_same_lease(const files_struct *fsp,
2181                           const struct share_mode_data *d,
2182                           const struct share_mode_entry *e,
2183                           const struct smb2_lease *lease)
2184 {
2185         if (e->op_type != LEASE_OPLOCK) {
2186                 return false;
2187         }
2188         if (lease == NULL) {
2189                 return false;
2190         }
2191
2192         return smb2_lease_equal(fsp_client_guid(fsp),
2193                                 &lease->lease_key,
2194                                 &e->client_guid,
2195                                 &e->lease_key);
2196 }
2197
2198 static int map_lease_type_to_oplock(uint32_t lease_type)
2199 {
2200         int result = NO_OPLOCK;
2201
2202         switch (lease_type) {
2203         case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
2204                 result = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
2205                 break;
2206         case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
2207                 result = EXCLUSIVE_OPLOCK;
2208                 break;
2209         case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
2210         case SMB2_LEASE_READ:
2211                 result = LEVEL_II_OPLOCK;
2212                 break;
2213         }
2214
2215         return result;
2216 }
2217
2218 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
2219                                       struct files_struct *fsp,
2220                                       struct share_mode_lock *lck,
2221                                       int oplock_request,
2222                                       struct smb2_lease *lease)
2223 {
2224         struct share_mode_data *d = lck->data;
2225         bool got_handle_lease = false;
2226         bool got_oplock = false;
2227         uint32_t i;
2228         uint32_t granted;
2229         const struct GUID *client_guid = NULL;
2230         const struct smb2_lease_key *lease_key = NULL;
2231         bool ok;
2232         NTSTATUS status;
2233
2234         if (oplock_request & INTERNAL_OPEN_ONLY) {
2235                 /* No oplocks on internal open. */
2236                 oplock_request = NO_OPLOCK;
2237                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2238                         fsp->oplock_type, fsp_str_dbg(fsp)));
2239         }
2240
2241         if (oplock_request == LEASE_OPLOCK) {
2242                 if (lease == NULL) {
2243                         /*
2244                          * The SMB2 layer should have checked this
2245                          */
2246                         return NT_STATUS_INTERNAL_ERROR;
2247                 }
2248
2249                 granted = lease->lease_state;
2250
2251                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
2252                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
2253                         granted = SMB2_LEASE_NONE;
2254                 }
2255                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
2256                         DEBUG(10, ("No read or write lease requested\n"));
2257                         granted = SMB2_LEASE_NONE;
2258                 }
2259                 if (granted == SMB2_LEASE_WRITE) {
2260                         DEBUG(10, ("pure write lease requested\n"));
2261                         granted = SMB2_LEASE_NONE;
2262                 }
2263                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
2264                         DEBUG(10, ("write and handle lease requested\n"));
2265                         granted = SMB2_LEASE_NONE;
2266                 }
2267         } else {
2268                 granted = map_oplock_to_lease_type(
2269                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2270         }
2271
2272         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
2273                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
2274                         fsp_str_dbg(fsp)));
2275                 granted &= ~SMB2_LEASE_READ;
2276         }
2277
2278         for (i=0; i<d->num_share_modes; i++) {
2279                 struct share_mode_entry *e = &d->share_modes[i];
2280                 uint32_t e_lease_type;
2281
2282                 e_lease_type = get_lease_type(d, e);
2283
2284                 if ((granted & SMB2_LEASE_WRITE) &&
2285                     !is_same_lease(fsp, d, e, lease) &&
2286                     !share_mode_stale_pid(d, i)) {
2287                         /*
2288                          * Can grant only one writer
2289                          */
2290                         granted &= ~SMB2_LEASE_WRITE;
2291                 }
2292
2293                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
2294                     !share_mode_stale_pid(d, i)) {
2295                         got_handle_lease = true;
2296                 }
2297
2298                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
2299                     !share_mode_stale_pid(d, i)) {
2300                         got_oplock = true;
2301                 }
2302         }
2303
2304         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
2305                 bool allow_level2 =
2306                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
2307                         lp_level2_oplocks(SNUM(fsp->conn));
2308
2309                 if (!allow_level2) {
2310                         granted = SMB2_LEASE_NONE;
2311                 }
2312         }
2313
2314         if (oplock_request == LEASE_OPLOCK) {
2315                 if (got_oplock) {
2316                         granted &= ~SMB2_LEASE_HANDLE;
2317                 }
2318
2319                 fsp->oplock_type = LEASE_OPLOCK;
2320
2321                 status = grant_fsp_lease(fsp, lck, lease, granted);
2322                 if (!NT_STATUS_IS_OK(status)) {
2323                         return status;
2324
2325                 }
2326                 *lease = fsp->lease->lease;
2327
2328                 lease_key = &fsp->lease->lease.lease_key;
2329                 client_guid = fsp_client_guid(fsp);
2330
2331                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
2332         } else {
2333                 if (got_handle_lease) {
2334                         granted = SMB2_LEASE_NONE;
2335                 }
2336
2337                 fsp->oplock_type = map_lease_type_to_oplock(granted);
2338
2339                 status = set_file_oplock(fsp);
2340                 if (!NT_STATUS_IS_OK(status)) {
2341                         /*
2342                          * Could not get the kernel oplock
2343                          */
2344                         fsp->oplock_type = NO_OPLOCK;
2345                 }
2346         }
2347
2348         ok = set_share_mode(
2349                 lck,
2350                 fsp,
2351                 get_current_uid(fsp->conn),
2352                 req ? req->mid : 0,
2353                 fsp->oplock_type,
2354                 client_guid,
2355                 lease_key);
2356         if (!ok) {
2357                 return NT_STATUS_NO_MEMORY;
2358         }
2359
2360         ok = update_num_read_oplocks(fsp, lck);
2361         if (!ok) {
2362                 del_share_mode(lck, fsp);
2363                 return NT_STATUS_INTERNAL_ERROR;
2364         }
2365
2366         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2367                   fsp->oplock_type, fsp_str_dbg(fsp)));
2368
2369         return NT_STATUS_OK;
2370 }
2371
2372 static bool request_timed_out(struct timeval request_time,
2373                               struct timeval timeout)
2374 {
2375         struct timeval now, end_time;
2376         GetTimeOfDay(&now);
2377         end_time = timeval_sum(&request_time, &timeout);
2378         return (timeval_compare(&end_time, &now) < 0);
2379 }
2380
2381 static struct deferred_open_record *deferred_open_record_create(
2382         bool delayed_for_oplocks,
2383         bool async_open,
2384         struct file_id id)
2385 {
2386         struct deferred_open_record *record = NULL;
2387
2388         record = talloc(NULL, struct deferred_open_record);
2389         if (record == NULL) {
2390                 return NULL;
2391         }
2392
2393         *record = (struct deferred_open_record) {
2394                 .delayed_for_oplocks = delayed_for_oplocks,
2395                 .async_open = async_open,
2396                 .id = id,
2397         };
2398
2399         return record;
2400 }
2401
2402 struct defer_open_state {
2403         struct smbXsrv_connection *xconn;
2404         uint64_t mid;
2405 };
2406
2407 static void defer_open_done(struct tevent_req *req);
2408
2409 /**
2410  * Defer an open and watch a locking.tdb record
2411  *
2412  * This defers an open that gets rescheduled once the locking.tdb record watch
2413  * is triggered by a change to the record.
2414  *
2415  * It is used to defer opens that triggered an oplock break and for the SMB1
2416  * sharing violation delay.
2417  **/
2418 static void defer_open(struct share_mode_lock *lck,
2419                        struct timeval request_time,
2420                        struct timeval timeout,
2421                        struct smb_request *req,
2422                        bool delayed_for_oplocks,
2423                        struct file_id id)
2424 {
2425         struct deferred_open_record *open_rec = NULL;
2426         struct timeval abs_timeout;
2427         struct defer_open_state *watch_state;
2428         struct tevent_req *watch_req;
2429         bool ok;
2430
2431         abs_timeout = timeval_sum(&request_time, &timeout);
2432
2433         DBG_DEBUG("request time [%s] timeout [%s] mid [%" PRIu64 "] "
2434                   "delayed_for_oplocks [%s] file_id [%s]\n",
2435                   timeval_string(talloc_tos(), &request_time, false),
2436                   timeval_string(talloc_tos(), &abs_timeout, false),
2437                   req->mid,
2438                   delayed_for_oplocks ? "yes" : "no",
2439                   file_id_string_tos(&id));
2440
2441         open_rec = deferred_open_record_create(delayed_for_oplocks,
2442                                                false,
2443                                                id);
2444         if (open_rec == NULL) {
2445                 TALLOC_FREE(lck);
2446                 exit_server("talloc failed");
2447         }
2448
2449         watch_state = talloc(open_rec, struct defer_open_state);
2450         if (watch_state == NULL) {
2451                 exit_server("talloc failed");
2452         }
2453         watch_state->xconn = req->xconn;
2454         watch_state->mid = req->mid;
2455
2456         DBG_DEBUG("defering mid %" PRIu64 "\n", req->mid);
2457
2458         watch_req = dbwrap_watched_watch_send(watch_state,
2459                                               req->sconn->ev_ctx,
2460                                               lck->data->record,
2461                                               (struct server_id){0});
2462         if (watch_req == NULL) {
2463                 exit_server("Could not watch share mode record");
2464         }
2465         tevent_req_set_callback(watch_req, defer_open_done, watch_state);
2466
2467         ok = tevent_req_set_endtime(watch_req, req->sconn->ev_ctx, abs_timeout);
2468         if (!ok) {
2469                 exit_server("tevent_req_set_endtime failed");
2470         }
2471
2472         ok = push_deferred_open_message_smb(req, request_time, timeout,
2473                                             open_rec->id, open_rec);
2474         if (!ok) {
2475                 TALLOC_FREE(lck);
2476                 exit_server("push_deferred_open_message_smb failed");
2477         }
2478 }
2479
2480 static void defer_open_done(struct tevent_req *req)
2481 {
2482         struct defer_open_state *state = tevent_req_callback_data(
2483                 req, struct defer_open_state);
2484         NTSTATUS status;
2485         bool ret;
2486
2487         status = dbwrap_watched_watch_recv(req, NULL, NULL);
2488         TALLOC_FREE(req);
2489         if (!NT_STATUS_IS_OK(status)) {
2490                 DEBUG(5, ("dbwrap_watched_watch_recv returned %s\n",
2491                           nt_errstr(status)));
2492                 /*
2493                  * Even if it failed, retry anyway. TODO: We need a way to
2494                  * tell a re-scheduled open about that error.
2495                  */
2496         }
2497
2498         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
2499
2500         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
2501         SMB_ASSERT(ret);
2502         TALLOC_FREE(state);
2503 }
2504
2505 /**
2506  * Actually attempt the kernel oplock polling open.
2507  */
2508
2509 static void kernel_oplock_poll_open_timer(struct tevent_context *ev,
2510                                       struct tevent_timer *te,
2511                                       struct timeval current_time,
2512                                       void *private_data)
2513 {
2514         bool ok;
2515         struct smb_request *req = (struct smb_request *)private_data;
2516
2517         ok = schedule_deferred_open_message_smb(req->xconn, req->mid);
2518         if (!ok) {
2519                 exit_server("schedule_deferred_open_message_smb failed");
2520         }
2521         DBG_DEBUG("kernel_oplock_poll_open_timer fired. Retying open !\n");
2522 }
2523
2524 /**
2525  * Reschedule an open for 1 second from now, if not timed out.
2526  **/
2527 static void setup_kernel_oplock_poll_open(struct timeval request_time,
2528                        struct smb_request *req,
2529                        struct file_id id)
2530 {
2531
2532         bool ok;
2533         struct deferred_open_record *open_rec = NULL;
2534         /* Maximum wait time. */
2535         struct timeval timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2536
2537         if (request_timed_out(request_time, timeout)) {
2538                 return;
2539         }
2540
2541         open_rec = deferred_open_record_create(false, false, id);
2542         if (open_rec == NULL) {
2543                 exit_server("talloc failed");
2544         }
2545
2546         ok = push_deferred_open_message_smb(req,
2547                                             request_time,
2548                                             timeout,
2549                                             id,
2550                                             open_rec);
2551         if (!ok) {
2552                 exit_server("push_deferred_open_message_smb failed");
2553         }
2554
2555         /*
2556          * As this timer event is owned by req, it will
2557          * disappear if req it talloc_freed.
2558          */
2559         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2560                                         req,
2561                                         timeval_current_ofs(1, 0),
2562                                         kernel_oplock_poll_open_timer,
2563                                         req);
2564         if (open_rec->te == NULL) {
2565                 exit_server("tevent_add_timer failed");
2566         }
2567
2568         DBG_DEBUG("poll request time [%s] mid [%" PRIu64 "] file_id [%s]\n",
2569                   timeval_string(talloc_tos(), &request_time, false),
2570                   req->mid,
2571                   file_id_string_tos(&id));
2572 }
2573
2574 /****************************************************************************
2575  On overwrite open ensure that the attributes match.
2576 ****************************************************************************/
2577
2578 static bool open_match_attributes(connection_struct *conn,
2579                                   uint32_t old_dos_attr,
2580                                   uint32_t new_dos_attr,
2581                                   mode_t new_unx_mode,
2582                                   mode_t *returned_unx_mode)
2583 {
2584         uint32_t noarch_old_dos_attr, noarch_new_dos_attr;
2585
2586         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2587         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2588
2589         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
2590            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2591                 *returned_unx_mode = new_unx_mode;
2592         } else {
2593                 *returned_unx_mode = (mode_t)0;
2594         }
2595
2596         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2597                   "new_dos_attr = 0x%x "
2598                   "returned_unx_mode = 0%o\n",
2599                   (unsigned int)old_dos_attr,
2600                   (unsigned int)new_dos_attr,
2601                   (unsigned int)*returned_unx_mode ));
2602
2603         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2604         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2605                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2606                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2607                         return False;
2608                 }
2609         }
2610         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2611                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2612                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2613                         return False;
2614                 }
2615         }
2616         return True;
2617 }
2618
2619 /****************************************************************************
2620  Special FCB or DOS processing in the case of a sharing violation.
2621  Try and find a duplicated file handle.
2622 ****************************************************************************/
2623
2624 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2625                                 connection_struct *conn,
2626                                 files_struct *fsp_to_dup_into,
2627                                 const struct smb_filename *smb_fname,
2628                                 struct file_id id,
2629                                 uint16_t file_pid,
2630                                 uint64_t vuid,
2631                                 uint32_t access_mask,
2632                                 uint32_t share_access,
2633                                 uint32_t create_options)
2634 {
2635         files_struct *fsp;
2636
2637         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2638                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2639
2640         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2641             fsp = file_find_di_next(fsp)) {
2642
2643                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2644                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2645                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2646                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2647                           (unsigned int)fsp->file_pid,
2648                           (unsigned int)fsp->fh->private_options,
2649                           (unsigned int)fsp->access_mask ));
2650
2651                 if (fsp != fsp_to_dup_into &&
2652                     fsp->fh->fd != -1 &&
2653                     fsp->vuid == vuid &&
2654                     fsp->file_pid == file_pid &&
2655                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2656                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2657                     (fsp->access_mask & FILE_WRITE_DATA) &&
2658                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2659                     strequal(fsp->fsp_name->stream_name,
2660                              smb_fname->stream_name)) {
2661                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2662                         break;
2663                 }
2664         }
2665
2666         if (!fsp) {
2667                 return NT_STATUS_NOT_FOUND;
2668         }
2669
2670         /* quite an insane set of semantics ... */
2671         if (is_executable(smb_fname->base_name) &&
2672             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2673                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2674                 return NT_STATUS_INVALID_PARAMETER;
2675         }
2676
2677         /* We need to duplicate this fsp. */
2678         return dup_file_fsp(req, fsp, access_mask, share_access,
2679                             create_options, fsp_to_dup_into);
2680 }
2681
2682 static void schedule_defer_open(struct share_mode_lock *lck,
2683                                 struct file_id id,
2684                                 struct timeval request_time,
2685                                 struct smb_request *req)
2686 {
2687         /* This is a relative time, added to the absolute
2688            request_time value to get the absolute timeout time.
2689            Note that if this is the second or greater time we enter
2690            this codepath for this particular request mid then
2691            request_time is left as the absolute time of the *first*
2692            time this request mid was processed. This is what allows
2693            the request to eventually time out. */
2694
2695         struct timeval timeout;
2696
2697         /* Normally the smbd we asked should respond within
2698          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2699          * the client did, give twice the timeout as a safety
2700          * measure here in case the other smbd is stuck
2701          * somewhere else. */
2702
2703         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2704
2705         if (request_timed_out(request_time, timeout)) {
2706                 return;
2707         }
2708
2709         defer_open(lck, request_time, timeout, req, true, id);
2710 }
2711
2712 /****************************************************************************
2713  Reschedule an open call that went asynchronous.
2714 ****************************************************************************/
2715
2716 static void schedule_async_open_timer(struct tevent_context *ev,
2717                                       struct tevent_timer *te,
2718                                       struct timeval current_time,
2719                                       void *private_data)
2720 {
2721         exit_server("async open timeout");
2722 }
2723
2724 static void schedule_async_open(struct timeval request_time,
2725                                 struct smb_request *req)
2726 {
2727         struct deferred_open_record *open_rec = NULL;
2728         struct timeval timeout = timeval_set(20, 0);
2729         bool ok;
2730
2731         if (request_timed_out(request_time, timeout)) {
2732                 return;
2733         }
2734
2735         open_rec = deferred_open_record_create(false, true, (struct file_id){0});
2736         if (open_rec == NULL) {
2737                 exit_server("deferred_open_record_create failed");
2738         }
2739
2740         ok = push_deferred_open_message_smb(req, request_time, timeout,
2741                                             (struct file_id){0}, open_rec);
2742         if (!ok) {
2743                 exit_server("push_deferred_open_message_smb failed");
2744         }
2745
2746         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2747                                         req,
2748                                         timeval_current_ofs(20, 0),
2749                                         schedule_async_open_timer,
2750                                         open_rec);
2751         if (open_rec->te == NULL) {
2752                 exit_server("tevent_add_timer failed");
2753         }
2754 }
2755
2756 /****************************************************************************
2757  Work out what access_mask to use from what the client sent us.
2758 ****************************************************************************/
2759
2760 static NTSTATUS smbd_calculate_maximum_allowed_access(
2761         connection_struct *conn,
2762         const struct smb_filename *smb_fname,
2763         bool use_privs,
2764         uint32_t *p_access_mask)
2765 {
2766         struct security_descriptor *sd;
2767         uint32_t access_granted;
2768         NTSTATUS status;
2769
2770         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2771                 *p_access_mask |= FILE_GENERIC_ALL;
2772                 return NT_STATUS_OK;
2773         }
2774
2775         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
2776                                     (SECINFO_OWNER |
2777                                      SECINFO_GROUP |
2778                                      SECINFO_DACL),
2779                                     talloc_tos(), &sd);
2780
2781         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2782                 /*
2783                  * File did not exist
2784                  */
2785                 *p_access_mask = FILE_GENERIC_ALL;
2786                 return NT_STATUS_OK;
2787         }
2788         if (!NT_STATUS_IS_OK(status)) {
2789                 DEBUG(10,("Could not get acl on file %s: %s\n",
2790                           smb_fname_str_dbg(smb_fname),
2791                           nt_errstr(status)));
2792                 return NT_STATUS_ACCESS_DENIED;
2793         }
2794
2795         /*
2796          * If we can access the path to this file, by
2797          * default we have FILE_READ_ATTRIBUTES from the
2798          * containing directory. See the section:
2799          * "Algorithm to Check Access to an Existing File"
2800          * in MS-FSA.pdf.
2801          *
2802          * se_file_access_check()
2803          * also takes care of owner WRITE_DAC and READ_CONTROL.
2804          */
2805         status = se_file_access_check(sd,
2806                                  get_current_nttok(conn),
2807                                  use_privs,
2808                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2809                                  &access_granted);
2810
2811         TALLOC_FREE(sd);
2812
2813         if (!NT_STATUS_IS_OK(status)) {
2814                 DEBUG(10, ("Access denied on file %s: "
2815                            "when calculating maximum access\n",
2816                            smb_fname_str_dbg(smb_fname)));
2817                 return NT_STATUS_ACCESS_DENIED;
2818         }
2819         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2820
2821         if (!(access_granted & DELETE_ACCESS)) {
2822                 if (can_delete_file_in_directory(conn, smb_fname)) {
2823                         *p_access_mask |= DELETE_ACCESS;
2824                 }
2825         }
2826
2827         return NT_STATUS_OK;
2828 }
2829
2830 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2831                                     const struct smb_filename *smb_fname,
2832                                     bool use_privs,
2833                                     uint32_t access_mask,
2834                                     uint32_t *access_mask_out)
2835 {
2836         NTSTATUS status;
2837         uint32_t orig_access_mask = access_mask;
2838         uint32_t rejected_share_access;
2839
2840         if (access_mask & SEC_MASK_INVALID) {
2841                 DBG_DEBUG("access_mask [%8x] contains invalid bits\n",
2842                           access_mask);
2843                 return NT_STATUS_ACCESS_DENIED;
2844         }
2845
2846         /*
2847          * Convert GENERIC bits to specific bits.
2848          */
2849
2850         se_map_generic(&access_mask, &file_generic_mapping);
2851
2852         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2853         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2854
2855                 status = smbd_calculate_maximum_allowed_access(
2856                         conn, smb_fname, use_privs, &access_mask);
2857
2858                 if (!NT_STATUS_IS_OK(status)) {
2859                         return status;
2860                 }
2861
2862                 access_mask &= conn->share_access;
2863         }
2864
2865         rejected_share_access = access_mask & ~(conn->share_access);
2866
2867         if (rejected_share_access) {
2868                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2869                         "file %s: rejected by share access mask[0x%08X] "
2870                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2871                         smb_fname_str_dbg(smb_fname),
2872                         conn->share_access,
2873                         orig_access_mask, access_mask,
2874                         rejected_share_access));
2875                 return NT_STATUS_ACCESS_DENIED;
2876         }
2877
2878         *access_mask_out = access_mask;
2879         return NT_STATUS_OK;
2880 }
2881
2882 /****************************************************************************
2883  Remove the deferred open entry under lock.
2884 ****************************************************************************/
2885
2886 /****************************************************************************
2887  Return true if this is a state pointer to an asynchronous create.
2888 ****************************************************************************/
2889
2890 bool is_deferred_open_async(const struct deferred_open_record *rec)
2891 {
2892         return rec->async_open;
2893 }
2894
2895 static bool clear_ads(uint32_t create_disposition)
2896 {
2897         bool ret = false;
2898
2899         switch (create_disposition) {
2900         case FILE_SUPERSEDE:
2901         case FILE_OVERWRITE_IF:
2902         case FILE_OVERWRITE:
2903                 ret = true;
2904                 break;
2905         default:
2906                 break;
2907         }
2908         return ret;
2909 }
2910
2911 static int disposition_to_open_flags(uint32_t create_disposition)
2912 {
2913         int ret = 0;
2914
2915         /*
2916          * Currently we're using FILE_SUPERSEDE as the same as
2917          * FILE_OVERWRITE_IF but they really are
2918          * different. FILE_SUPERSEDE deletes an existing file
2919          * (requiring delete access) then recreates it.
2920          */
2921
2922         switch (create_disposition) {
2923         case FILE_SUPERSEDE:
2924         case FILE_OVERWRITE_IF:
2925                 /*
2926                  * If file exists replace/overwrite. If file doesn't
2927                  * exist create.
2928                  */
2929                 ret = O_CREAT|O_TRUNC;
2930                 break;
2931
2932         case FILE_OPEN:
2933                 /*
2934                  * If file exists open. If file doesn't exist error.
2935                  */
2936                 ret = 0;
2937                 break;
2938
2939         case FILE_OVERWRITE:
2940                 /*
2941                  * If file exists overwrite. If file doesn't exist
2942                  * error.
2943                  */
2944                 ret = O_TRUNC;
2945                 break;
2946
2947         case FILE_CREATE:
2948                 /*
2949                  * If file exists error. If file doesn't exist create.
2950                  */
2951                 ret = O_CREAT|O_EXCL;
2952                 break;
2953
2954         case FILE_OPEN_IF:
2955                 /*
2956                  * If file exists open. If file doesn't exist create.
2957                  */
2958                 ret = O_CREAT;
2959                 break;
2960         }
2961         return ret;
2962 }
2963
2964 static int calculate_open_access_flags(uint32_t access_mask,
2965                                        uint32_t private_flags)
2966 {
2967         bool need_write, need_read;
2968
2969         /*
2970          * Note that we ignore the append flag as append does not
2971          * mean the same thing under DOS and Unix.
2972          */
2973
2974         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2975         if (!need_write) {
2976                 return O_RDONLY;
2977         }
2978
2979         /* DENY_DOS opens are always underlying read-write on the
2980            file handle, no matter what the requested access mask
2981            says. */
2982
2983         need_read =
2984                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2985                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2986                                 FILE_READ_EA|FILE_EXECUTE));
2987
2988         if (!need_read) {
2989                 return O_WRONLY;
2990         }
2991         return O_RDWR;
2992 }
2993
2994 /****************************************************************************
2995  Open a file with a share mode. Passed in an already created files_struct *.
2996 ****************************************************************************/
2997
2998 static NTSTATUS open_file_ntcreate(connection_struct *conn,
2999                             struct smb_request *req,
3000                             uint32_t access_mask,               /* access bits (FILE_READ_DATA etc.) */
3001                             uint32_t share_access,      /* share constants (FILE_SHARE_READ etc) */
3002                             uint32_t create_disposition,        /* FILE_OPEN_IF etc. */
3003                             uint32_t create_options,    /* options such as delete on close. */
3004                             uint32_t new_dos_attributes,        /* attributes used for new file. */
3005                             int oplock_request,         /* internal Samba oplock codes. */
3006                             struct smb2_lease *lease,
3007                                                         /* Information (FILE_EXISTS etc.) */
3008                             uint32_t private_flags,     /* Samba specific flags. */
3009                             int *pinfo,
3010                             files_struct *fsp)
3011 {
3012         struct smb_filename *smb_fname = fsp->fsp_name;
3013         int flags=0;
3014         int flags2=0;
3015         bool file_existed = VALID_STAT(smb_fname->st);
3016         bool def_acl = False;
3017         bool posix_open = False;
3018         bool new_file_created = False;
3019         bool first_open_attempt = true;
3020         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
3021         mode_t new_unx_mode = (mode_t)0;
3022         mode_t unx_mode = (mode_t)0;
3023         int info;
3024         uint32_t existing_dos_attributes = 0;
3025         struct timeval request_time = timeval_zero();
3026         struct share_mode_lock *lck = NULL;
3027         uint32_t open_access_mask = access_mask;
3028         NTSTATUS status;
3029         char *parent_dir;
3030         SMB_STRUCT_STAT saved_stat = smb_fname->st;
3031         struct timespec old_write_time;
3032         struct file_id id;
3033
3034         if (conn->printer) {
3035                 /*
3036                  * Printers are handled completely differently.
3037                  * Most of the passed parameters are ignored.
3038                  */
3039
3040                 if (pinfo) {
3041                         *pinfo = FILE_WAS_CREATED;
3042                 }
3043
3044                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
3045                            smb_fname_str_dbg(smb_fname)));
3046
3047                 if (!req) {
3048                         DEBUG(0,("open_file_ntcreate: printer open without "
3049                                 "an SMB request!\n"));
3050                         return NT_STATUS_INTERNAL_ERROR;
3051                 }
3052
3053                 return print_spool_open(fsp, smb_fname->base_name,
3054                                         req->vuid);
3055         }
3056
3057         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
3058                             NULL)) {
3059                 return NT_STATUS_NO_MEMORY;
3060         }
3061
3062         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3063                 posix_open = True;
3064                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3065                 new_dos_attributes = 0;
3066         } else {
3067                 /* Windows allows a new file to be created and
3068                    silently removes a FILE_ATTRIBUTE_DIRECTORY
3069                    sent by the client. Do the same. */
3070
3071                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
3072
3073                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
3074                  * created new. */
3075                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3076                                      smb_fname, parent_dir);
3077         }
3078
3079         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
3080                    "access_mask=0x%x share_access=0x%x "
3081                    "create_disposition = 0x%x create_options=0x%x "
3082                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
3083                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
3084                    access_mask, share_access, create_disposition,
3085                    create_options, (unsigned int)unx_mode, oplock_request,
3086                    (unsigned int)private_flags));
3087
3088         if (req == NULL) {
3089                 /* Ensure req == NULL means INTERNAL_OPEN_ONLY */
3090                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) != 0));
3091         } else {
3092                 /* And req != NULL means no INTERNAL_OPEN_ONLY */
3093                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) == 0));
3094         }
3095
3096         /*
3097          * Only non-internal opens can be deferred at all
3098          */
3099
3100         if (req) {
3101                 struct deferred_open_record *open_rec;
3102                 if (get_deferred_open_message_state(req,
3103                                 &request_time,
3104                                 &open_rec)) {
3105                         /* Remember the absolute time of the original
3106                            request with this mid. We'll use it later to
3107                            see if this has timed out. */
3108
3109                         /* If it was an async create retry, the file
3110                            didn't exist. */
3111
3112                         if (is_deferred_open_async(open_rec)) {
3113                                 SET_STAT_INVALID(smb_fname->st);
3114                                 file_existed = false;
3115                         }
3116
3117                         /* Ensure we don't reprocess this message. */
3118                         remove_deferred_open_message_smb(req->xconn, req->mid);
3119
3120                         first_open_attempt = false;
3121                 }
3122         }
3123
3124         if (!posix_open) {
3125                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
3126                 if (file_existed) {
3127                         /*
3128                          * Only use strored DOS attributes for checks
3129                          * against requested attributes (below via
3130                          * open_match_attributes()), cf bug #11992
3131                          * for details. -slow
3132                          */
3133                         uint32_t attr = 0;
3134
3135                         status = SMB_VFS_GET_DOS_ATTRIBUTES(conn, smb_fname, &attr);
3136                         if (NT_STATUS_IS_OK(status)) {
3137                                 existing_dos_attributes = attr;
3138                         }
3139                 }
3140         }
3141
3142         /* ignore any oplock requests if oplocks are disabled */
3143         if (!lp_oplocks(SNUM(conn)) ||
3144             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
3145                 /* Mask off everything except the private Samba bits. */
3146                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
3147         }
3148
3149         /* this is for OS/2 long file names - say we don't support them */
3150         if (req != NULL && !req->posix_pathnames &&
3151                         strstr(smb_fname->base_name,".+,;=[].")) {
3152                 /* OS/2 Workplace shell fix may be main code stream in a later
3153                  * release. */
3154                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
3155                          "supported.\n"));
3156                 if (use_nt_status()) {
3157                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3158                 }
3159                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
3160         }
3161
3162         switch( create_disposition ) {
3163                 case FILE_OPEN:
3164                         /* If file exists open. If file doesn't exist error. */
3165                         if (!file_existed) {
3166                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
3167                                          "requested for file %s and file "
3168                                          "doesn't exist.\n",
3169                                          smb_fname_str_dbg(smb_fname)));
3170                                 errno = ENOENT;
3171                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3172                         }
3173                         break;
3174
3175                 case FILE_OVERWRITE:
3176                         /* If file exists overwrite. If file doesn't exist
3177                          * error. */
3178                         if (!file_existed) {
3179                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
3180                                          "requested for file %s and file "
3181                                          "doesn't exist.\n",
3182                                          smb_fname_str_dbg(smb_fname) ));
3183                                 errno = ENOENT;
3184                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3185                         }
3186                         break;
3187
3188                 case FILE_CREATE:
3189                         /* If file exists error. If file doesn't exist
3190                          * create. */
3191                         if (file_existed) {
3192                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
3193                                          "requested for file %s and file "
3194                                          "already exists.\n",
3195                                          smb_fname_str_dbg(smb_fname)));
3196                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
3197                                         errno = EISDIR;
3198                                 } else {
3199                                         errno = EEXIST;
3200                                 }
3201                                 return map_nt_error_from_unix(errno);
3202                         }
3203                         break;
3204
3205                 case FILE_SUPERSEDE:
3206                 case FILE_OVERWRITE_IF:
3207                 case FILE_OPEN_IF:
3208                         break;
3209                 default:
3210                         return NT_STATUS_INVALID_PARAMETER;
3211         }
3212
3213         flags2 = disposition_to_open_flags(create_disposition);
3214
3215         /* We only care about matching attributes on file exists and
3216          * overwrite. */
3217
3218         if (!posix_open && file_existed &&
3219             ((create_disposition == FILE_OVERWRITE) ||
3220              (create_disposition == FILE_OVERWRITE_IF))) {
3221                 if (!open_match_attributes(conn, existing_dos_attributes,
3222                                            new_dos_attributes,
3223                                            unx_mode, &new_unx_mode)) {
3224                         DEBUG(5,("open_file_ntcreate: attributes mismatch "
3225                                  "for file %s (%x %x) (0%o, 0%o)\n",
3226                                  smb_fname_str_dbg(smb_fname),
3227                                  existing_dos_attributes,
3228                                  new_dos_attributes,
3229                                  (unsigned int)smb_fname->st.st_ex_mode,
3230                                  (unsigned int)unx_mode ));
3231                         errno = EACCES;
3232                         return NT_STATUS_ACCESS_DENIED;
3233                 }
3234         }
3235
3236         status = smbd_calculate_access_mask(conn, smb_fname,
3237                                         false,
3238                                         access_mask,
3239                                         &access_mask);
3240         if (!NT_STATUS_IS_OK(status)) {
3241                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
3242                         "on file %s returned %s\n",
3243                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
3244                 return status;
3245         }
3246
3247         open_access_mask = access_mask;
3248
3249         if (flags2 & O_TRUNC) {
3250                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
3251         }
3252
3253         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
3254                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
3255                     access_mask));
3256
3257         /*
3258          * Note that we ignore the append flag as append does not
3259          * mean the same thing under DOS and Unix.
3260          */
3261
3262         flags = calculate_open_access_flags(access_mask, private_flags);
3263
3264         /*
3265          * Currently we only look at FILE_WRITE_THROUGH for create options.
3266          */
3267
3268 #if defined(O_SYNC)
3269         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
3270                 flags2 |= O_SYNC;
3271         }
3272 #endif /* O_SYNC */
3273
3274         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
3275                 flags2 |= O_APPEND;
3276         }
3277
3278         if (!posix_open && !CAN_WRITE(conn)) {
3279                 /*
3280                  * We should really return a permission denied error if either
3281                  * O_CREAT or O_TRUNC are set, but for compatibility with
3282                  * older versions of Samba we just AND them out.
3283                  */
3284                 flags2 &= ~(O_CREAT|O_TRUNC);
3285         }
3286
3287         if (lp_kernel_oplocks(SNUM(conn))) {
3288                 /*
3289                  * With kernel oplocks the open breaking an oplock
3290                  * blocks until the oplock holder has given up the
3291                  * oplock or closed the file. We prevent this by always
3292                  * trying to open the file with O_NONBLOCK (see "man
3293                  * fcntl" on Linux).
3294                  *
3295                  * If a process that doesn't use the smbd open files
3296                  * database or communication methods holds a kernel
3297                  * oplock we must periodically poll for available open
3298                  * using O_NONBLOCK.
3299                  */
3300                 flags2 |= O_NONBLOCK;
3301         }
3302
3303         /*
3304          * Ensure we can't write on a read-only share or file.
3305          */
3306
3307         if (flags != O_RDONLY && file_existed &&
3308             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
3309                 DEBUG(5,("open_file_ntcreate: write access requested for "
3310                          "file %s on read only %s\n",
3311                          smb_fname_str_dbg(smb_fname),
3312                          !CAN_WRITE(conn) ? "share" : "file" ));
3313                 errno = EACCES;
3314                 return NT_STATUS_ACCESS_DENIED;
3315         }
3316
3317         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
3318         fsp->share_access = share_access;
3319         fsp->fh->private_options = private_flags;
3320         fsp->access_mask = open_access_mask; /* We change this to the
3321                                               * requested access_mask after
3322                                               * the open is done. */
3323         if (posix_open) {
3324                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
3325         }
3326
3327         if (timeval_is_zero(&request_time)) {
3328                 request_time = fsp->open_time;
3329         }
3330
3331         if ((create_options & FILE_DELETE_ON_CLOSE) &&
3332                         (flags2 & O_CREAT) &&
3333                         !file_existed) {
3334                 /* Delete on close semantics for new files. */
3335                 status = can_set_delete_on_close(fsp,
3336                                                 new_dos_attributes);
3337                 if (!NT_STATUS_IS_OK(status)) {
3338                         fd_close(fsp);
3339                         return status;
3340                 }
3341         }
3342
3343         /*
3344          * Ensure we pay attention to default ACLs on directories if required.
3345          */
3346
3347         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
3348             (def_acl = directory_has_default_acl(conn, parent_dir))) {
3349                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
3350         }
3351
3352         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
3353                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
3354                  (unsigned int)flags, (unsigned int)flags2,
3355                  (unsigned int)unx_mode, (unsigned int)access_mask,
3356                  (unsigned int)open_access_mask));
3357
3358         fsp_open = open_file(fsp, conn, req, parent_dir,
3359                              flags|flags2, unx_mode, access_mask,
3360                              open_access_mask, &new_file_created);
3361
3362         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
3363                 bool delay;
3364
3365                 /*
3366                  * This handles the kernel oplock case:
3367                  *
3368                  * the file has an active kernel oplock and the open() returned
3369                  * EWOULDBLOCK/EAGAIN which maps to NETWORK_BUSY.
3370                  *
3371                  * "Samba locking.tdb oplocks" are handled below after acquiring
3372                  * the sharemode lock with get_share_mode_lock().
3373                  */
3374                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
3375                         DEBUG(10, ("FIFO busy\n"));
3376                         return NT_STATUS_NETWORK_BUSY;
3377                 }
3378                 if (req == NULL) {
3379                         DEBUG(10, ("Internal open busy\n"));
3380                         return NT_STATUS_NETWORK_BUSY;
3381                 }
3382
3383                 /*
3384                  * From here on we assume this is an oplock break triggered
3385                  */
3386
3387                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
3388                 if (lck == NULL) {
3389                         /*
3390                          * No oplock from Samba around. Set up a poll every 1
3391                          * second to retry a non-blocking open until the time
3392                          * expires.
3393                          */
3394                         setup_kernel_oplock_poll_open(request_time,
3395                                                 req,
3396                                                 fsp->file_id);
3397                         DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3398                                 "Retrying with poll\n");
3399                         return NT_STATUS_SHARING_VIOLATION;
3400                 }
3401
3402                 if (!validate_oplock_types(lck)) {
3403                         smb_panic("validate_oplock_types failed");
3404                 }
3405
3406                 delay = delay_for_oplock(fsp, 0, lease, lck, false,
3407                                          create_disposition,
3408                                          first_open_attempt);
3409                 if (delay) {
3410                         schedule_defer_open(lck, fsp->file_id, request_time,
3411                                             req);
3412                         TALLOC_FREE(lck);
3413                         DEBUG(10, ("Sent oplock break request to kernel "
3414                                    "oplock holder\n"));
3415                         return NT_STATUS_SHARING_VIOLATION;
3416                 }
3417
3418                 /*
3419                  * No oplock from Samba around. Set up a poll every 1
3420                  * second to retry a non-blocking open until the time
3421                  * expires.
3422                  */
3423                 setup_kernel_oplock_poll_open(request_time, req, fsp->file_id);
3424
3425                 TALLOC_FREE(lck);
3426                 DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3427                         "Retrying with poll\n");
3428                 return NT_STATUS_SHARING_VIOLATION;
3429         }
3430
3431         if (!NT_STATUS_IS_OK(fsp_open)) {
3432                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
3433                         schedule_async_open(request_time, req);
3434                 }
3435                 return fsp_open;
3436         }
3437
3438         if (new_file_created) {
3439                 /*
3440                  * As we atomically create using O_CREAT|O_EXCL,
3441                  * then if new_file_created is true, then
3442                  * file_existed *MUST* have been false (even
3443                  * if the file was previously detected as being
3444                  * there).
3445                  */
3446                 file_existed = false;
3447         }
3448
3449         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
3450                 /*
3451                  * The file did exist, but some other (local or NFS)
3452                  * process either renamed/unlinked and re-created the
3453                  * file with different dev/ino after we walked the path,
3454                  * but before we did the open. We could retry the
3455                  * open but it's a rare enough case it's easier to
3456                  * just fail the open to prevent creating any problems
3457                  * in the open file db having the wrong dev/ino key.
3458                  */
3459                 fd_close(fsp);
3460                 DBG_WARNING("file %s - dev/ino mismatch. "
3461                             "Old (dev=%ju, ino=%ju). "
3462                             "New (dev=%ju, ino=%ju). Failing open "
3463                             "with NT_STATUS_ACCESS_DENIED.\n",
3464                             smb_fname_str_dbg(smb_fname),
3465                             (uintmax_t)saved_stat.st_ex_dev,
3466                             (uintmax_t)saved_stat.st_ex_ino,
3467                             (uintmax_t)smb_fname->st.st_ex_dev,
3468                             (uintmax_t)smb_fname->st.st_ex_ino);
3469                 return NT_STATUS_ACCESS_DENIED;
3470         }
3471
3472         old_write_time = smb_fname->st.st_ex_mtime;
3473
3474         /*
3475          * Deal with the race condition where two smbd's detect the
3476          * file doesn't exist and do the create at the same time. One
3477          * of them will win and set a share mode, the other (ie. this
3478          * one) should check if the requested share mode for this
3479          * create is allowed.
3480          */
3481
3482         /*
3483          * Now the file exists and fsp is successfully opened,
3484          * fsp->dev and fsp->inode are valid and should replace the
3485          * dev=0,inode=0 from a non existent file. Spotted by
3486          * Nadav Danieli <nadavd@exanet.com>. JRA.
3487          */
3488
3489         id = fsp->file_id;
3490
3491         lck = get_share_mode_lock(talloc_tos(), id,
3492                                   conn->connectpath,
3493                                   smb_fname, &old_write_time);
3494
3495         if (lck == NULL) {
3496                 DEBUG(0, ("open_file_ntcreate: Could not get share "
3497                           "mode lock for %s\n",
3498                           smb_fname_str_dbg(smb_fname)));
3499                 fd_close(fsp);
3500                 return NT_STATUS_SHARING_VIOLATION;
3501         }
3502
3503         /* Get the types we need to examine. */
3504         if (!validate_oplock_types(lck)) {
3505                 smb_panic("validate_oplock_types failed");
3506         }
3507
3508         if (has_delete_on_close(lck, fsp->name_hash)) {
3509                 TALLOC_FREE(lck);
3510                 fd_close(fsp);
3511                 return NT_STATUS_DELETE_PENDING;
3512         }
3513
3514         status = open_mode_check(conn, lck,
3515                                  access_mask, share_access);
3516
3517         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
3518             (lck->data->num_share_modes > 0)) {
3519                 /*
3520                  * This comes from ancient times out of open_mode_check. I
3521                  * have no clue whether this is still necessary. I can't think
3522                  * of a case where this would actually matter further down in
3523                  * this function. I leave it here for further investigation
3524                  * :-)
3525                  */
3526                 file_existed = true;
3527         }
3528
3529         if (req != NULL) {
3530                 /*
3531                  * Handle oplocks, deferring the request if delay_for_oplock()
3532                  * triggered a break message and we have to wait for the break
3533                  * response.
3534                  */
3535                 bool delay;
3536                 bool sharing_violation = NT_STATUS_EQUAL(
3537                         status, NT_STATUS_SHARING_VIOLATION);
3538
3539                 delay = delay_for_oplock(fsp, oplock_request, lease, lck,
3540                                          sharing_violation,
3541                                          create_disposition,
3542                                          first_open_attempt);
3543                 if (delay) {
3544                         schedule_defer_open(lck, fsp->file_id,
3545                                             request_time, req);
3546                         TALLOC_FREE(lck);
3547                         fd_close(fsp);
3548                         return NT_STATUS_SHARING_VIOLATION;
3549                 }
3550         }
3551
3552         if (!NT_STATUS_IS_OK(status)) {
3553                 uint32_t can_access_mask;
3554                 bool can_access = True;
3555
3556                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
3557
3558                 /* Check if this can be done with the deny_dos and fcb
3559                  * calls. */
3560                 if (private_flags &
3561                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
3562                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
3563                         if (req == NULL) {
3564                                 DEBUG(0, ("DOS open without an SMB "
3565                                           "request!\n"));
3566                                 TALLOC_FREE(lck);
3567                                 fd_close(fsp);
3568                                 return NT_STATUS_INTERNAL_ERROR;
3569                         }
3570
3571                         /* Use the client requested access mask here,
3572                          * not the one we open with. */
3573                         status = fcb_or_dos_open(req,
3574                                                  conn,
3575                                                  fsp,
3576                                                  smb_fname,
3577                                                  id,
3578                                                  req->smbpid,
3579                                                  req->vuid,
3580                                                  access_mask,
3581                                                  share_access,
3582                                                  create_options);
3583
3584                         if (NT_STATUS_IS_OK(status)) {
3585                                 TALLOC_FREE(lck);
3586                                 if (pinfo) {
3587                                         *pinfo = FILE_WAS_OPENED;
3588                                 }
3589                                 return NT_STATUS_OK;
3590                         }
3591                 }
3592
3593                 /*
3594                  * This next line is a subtlety we need for
3595                  * MS-Access. If a file open will fail due to share
3596                  * permissions and also for security (access) reasons,
3597                  * we need to return the access failed error, not the
3598                  * share error. We can't open the file due to kernel
3599                  * oplock deadlock (it's possible we failed above on
3600                  * the open_mode_check()) so use a userspace check.
3601                  */
3602
3603                 if (flags & O_RDWR) {
3604                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
3605                 } else if (flags & O_WRONLY) {
3606                         can_access_mask = FILE_WRITE_DATA;
3607                 } else {
3608                         can_access_mask = FILE_READ_DATA;
3609                 }
3610
3611                 if (((can_access_mask & FILE_WRITE_DATA) &&
3612                      !CAN_WRITE(conn)) ||
3613                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
3614                                                               smb_fname,
3615                                                               false,
3616                                                               can_access_mask))) {
3617                         can_access = False;
3618                 }
3619
3620                 /*
3621                  * If we're returning a share violation, ensure we
3622                  * cope with the braindead 1 second delay (SMB1 only).
3623                  */
3624
3625                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
3626                     !conn->sconn->using_smb2 &&
3627                     lp_defer_sharing_violations()) {
3628                         struct timeval timeout;
3629                         int timeout_usecs;
3630
3631                         /* this is a hack to speed up torture tests
3632                            in 'make test' */
3633                         timeout_usecs = lp_parm_int(SNUM(conn),
3634                                                     "smbd","sharedelay",
3635                                                     SHARING_VIOLATION_USEC_WAIT);
3636
3637                         /* This is a relative time, added to the absolute
3638                            request_time value to get the absolute timeout time.
3639                            Note that if this is the second or greater time we enter
3640                            this codepath for this particular request mid then
3641                            request_time is left as the absolute time of the *first*
3642                            time this request mid was processed. This is what allows
3643                            the request to eventually time out. */
3644
3645                         timeout = timeval_set(0, timeout_usecs);
3646
3647                         if (!request_timed_out(request_time, timeout)) {
3648                                 defer_open(lck, request_time, timeout, req,
3649                                            false, id);
3650                         }
3651                 }
3652
3653                 TALLOC_FREE(lck);
3654                 fd_close(fsp);
3655                 if (can_access) {
3656                         /*
3657                          * We have detected a sharing violation here
3658                          * so return the correct error code
3659                          */
3660                         status = NT_STATUS_SHARING_VIOLATION;
3661                 } else {
3662                         status = NT_STATUS_ACCESS_DENIED;
3663                 }
3664                 return status;
3665         }
3666
3667         /* Should we atomically (to the client at least) truncate ? */
3668         if ((!new_file_created) &&
3669             (flags2 & O_TRUNC) &&
3670             (!S_ISFIFO(fsp->fsp_name->st.st_ex_mode))) {
3671                 int ret;
3672
3673                 ret = SMB_VFS_FTRUNCATE(fsp, 0);
3674                 if (ret != 0) {
3675                         status = map_nt_error_from_unix(errno);
3676                         TALLOC_FREE(lck);
3677                         fd_close(fsp);
3678                         return status;
3679                 }
3680                 notify_fname(fsp->conn, NOTIFY_ACTION_MODIFIED,
3681                              FILE_NOTIFY_CHANGE_SIZE
3682                              | FILE_NOTIFY_CHANGE_ATTRIBUTES,
3683                              fsp->fsp_name->base_name);
3684         }
3685
3686         /*
3687          * We have the share entry *locked*.....
3688          */
3689
3690         /* Delete streams if create_disposition requires it */
3691         if (!new_file_created && clear_ads(create_disposition) &&
3692             !is_ntfs_stream_smb_fname(smb_fname)) {
3693                 status = delete_all_streams(conn, smb_fname);
3694                 if (!NT_STATUS_IS_OK(status)) {
3695                         TALLOC_FREE(lck);
3696                         fd_close(fsp);
3697                         return status;
3698                 }
3699         }
3700
3701         /* note that we ignore failure for the following. It is
3702            basically a hack for NFS, and NFS will never set one of
3703            these only read them. Nobody but Samba can ever set a deny
3704            mode and we have already checked our more authoritative
3705            locking database for permission to set this deny mode. If
3706            the kernel refuses the operations then the kernel is wrong.
3707            note that GPFS supports it as well - jmcd */
3708
3709         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
3710                 int ret_flock;
3711                 /*
3712                  * Beware: streams implementing VFS modules may
3713                  * implement streams in a way that fsp will have the
3714                  * basefile open in the fsp fd, so lacking a distinct
3715                  * fd for the stream kernel_flock will apply on the
3716                  * basefile which is wrong. The actual check is
3717                  * deffered to the VFS module implementing the
3718                  * kernel_flock call.
3719                  */
3720                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
3721                 if(ret_flock == -1 ){
3722
3723                         TALLOC_FREE(lck);
3724                         fd_close(fsp);
3725
3726                         return NT_STATUS_SHARING_VIOLATION;
3727                 }
3728
3729                 fsp->kernel_share_modes_taken = true;
3730         }
3731
3732         /*
3733          * At this point onwards, we can guarantee that the share entry
3734          * is locked, whether we created the file or not, and that the
3735          * deny mode is compatible with all current opens.
3736          */
3737
3738         /*
3739          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3740          * but we don't have to store this - just ignore it on access check.
3741          */
3742         if (conn->sconn->using_smb2) {
3743                 /*
3744                  * SMB2 doesn't return it (according to Microsoft tests).
3745                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
3746                  * File created with access = 0x7 (Read, Write, Delete)
3747                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
3748                  */
3749                 fsp->access_mask = access_mask;
3750         } else {
3751                 /* But SMB1 does. */
3752                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3753         }
3754
3755         if (file_existed) {
3756                 /*
3757                  * stat opens on existing files don't get oplocks.
3758                  * They can get leases.
3759                  *
3760                  * Note that we check for stat open on the *open_access_mask*,
3761                  * i.e. the access mask we actually used to do the open,
3762                  * not the one the client asked for (which is in
3763                  * fsp->access_mask). This is due to the fact that
3764                  * FILE_OVERWRITE and FILE_OVERWRITE_IF add in O_TRUNC,
3765                  * which adds FILE_WRITE_DATA to open_access_mask.
3766                  */
3767                 if (is_stat_open(open_access_mask) && lease == NULL) {
3768                         oplock_request = NO_OPLOCK;
3769                 }
3770         }
3771
3772         if (new_file_created) {
3773                 info = FILE_WAS_CREATED;
3774         } else {
3775                 if (flags2 & O_TRUNC) {
3776                         info = FILE_WAS_OVERWRITTEN;
3777                 } else {
3778                         info = FILE_WAS_OPENED;
3779                 }
3780         }
3781
3782         if (pinfo) {
3783                 *pinfo = info;
3784         }
3785
3786         /*
3787          * Setup the oplock info in both the shared memory and
3788          * file structs.
3789          */
3790         status = grant_fsp_oplock_type(req, fsp, lck, oplock_request, lease);
3791         if (!NT_STATUS_IS_OK(status)) {
3792                 TALLOC_FREE(lck);
3793                 fd_close(fsp);
3794                 return status;
3795         }
3796
3797         /* Handle strange delete on close create semantics. */
3798         if (create_options & FILE_DELETE_ON_CLOSE) {
3799                 if (!new_file_created) {
3800                         status = can_set_delete_on_close(fsp,
3801                                          existing_dos_attributes);
3802
3803                         if (!NT_STATUS_IS_OK(status)) {
3804                                 /* Remember to delete the mode we just added. */
3805                                 del_share_mode(lck, fsp);
3806                                 TALLOC_FREE(lck);
3807                                 fd_close(fsp);
3808                                 return status;
3809                         }
3810                 }
3811                 /* Note that here we set the *initial* delete on close flag,
3812                    not the regular one. The magic gets handled in close. */
3813                 fsp->initial_delete_on_close = True;
3814         }
3815
3816         if (info != FILE_WAS_OPENED) {
3817                 /* Overwritten files should be initially set as archive */
3818                 if ((info == FILE_WAS_OVERWRITTEN && lp_map_archive(SNUM(conn))) ||
3819                     lp_store_dos_attributes(SNUM(conn))) {
3820                         if (!posix_open) {
3821                                 if (file_set_dosmode(conn, smb_fname,
3822                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3823                                             parent_dir, true) == 0) {
3824                                         unx_mode = smb_fname->st.st_ex_mode;
3825                                 }
3826                         }
3827                 }
3828         }
3829
3830         /* Determine sparse flag. */
3831         if (posix_open) {
3832                 /* POSIX opens are sparse by default. */
3833                 fsp->is_sparse = true;
3834         } else {
3835                 fsp->is_sparse = (file_existed &&
3836                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
3837         }
3838
3839         /*
3840          * Take care of inherited ACLs on created files - if default ACL not
3841          * selected.
3842          */
3843
3844         if (!posix_open && new_file_created && !def_acl) {
3845                 if (unx_mode != smb_fname->st.st_ex_mode) {
3846                         int ret = SMB_VFS_FCHMOD(fsp, unx_mode);
3847                         if (ret == -1) {
3848                                 DBG_INFO("failed to reset "
3849                                   "attributes of file %s to 0%o\n",
3850                                   smb_fname_str_dbg(smb_fname),
3851                                   (unsigned int)unx_mode);
3852                         }
3853                 }
3854
3855         } else if (new_unx_mode) {
3856                 /*
3857                  * We only get here in the case of:
3858                  *
3859                  * a). Not a POSIX open.
3860                  * b). File already existed.
3861                  * c). File was overwritten.
3862                  * d). Requested DOS attributes didn't match
3863                  *     the DOS attributes on the existing file.
3864                  *
3865                  * In that case new_unx_mode has been set
3866                  * equal to the calculated mode (including
3867                  * possible inheritance of the mode from the
3868                  * containing directory).
3869                  *
3870                  * Note this mode was calculated with the
3871                  * DOS attribute FILE_ATTRIBUTE_ARCHIVE added,
3872                  * so the mode change here is suitable for
3873                  * an overwritten file.
3874                  */
3875
3876                 if (new_unx_mode != smb_fname->st.st_ex_mode) {
3877                         int ret = SMB_VFS_FCHMOD(fsp, new_unx_mode);
3878                         if (ret == -1) {
3879                                 DBG_INFO("failed to reset "
3880                                   "attributes of file %s to 0%o\n",
3881                                   smb_fname_str_dbg(smb_fname),
3882                                   (unsigned int)new_unx_mode);
3883                         }
3884                 }
3885         }
3886
3887         {
3888                 /*
3889                  * Deal with other opens having a modified write time.
3890                  */
3891                 struct timespec write_time = get_share_mode_write_time(lck);
3892
3893                 if (!null_timespec(write_time)) {
3894                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3895                 }
3896         }
3897
3898         TALLOC_FREE(lck);
3899
3900         return NT_STATUS_OK;
3901 }
3902
3903 static NTSTATUS mkdir_internal(connection_struct *conn,
3904                                struct smb_filename *smb_dname,
3905                                uint32_t file_attributes)
3906 {
3907         mode_t mode;
3908         char *parent_dir = NULL;
3909         NTSTATUS status;
3910         bool posix_open = false;
3911         bool need_re_stat = false;
3912         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
3913
3914         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
3915                 DEBUG(5,("mkdir_internal: failing share access "
3916                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
3917                 return NT_STATUS_ACCESS_DENIED;
3918         }
3919
3920         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
3921                             NULL)) {
3922                 return NT_STATUS_NO_MEMORY;
3923         }
3924
3925         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3926                 posix_open = true;
3927                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3928         } else {
3929                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
3930         }
3931
3932         status = check_parent_access(conn,
3933                                         smb_dname,
3934                                         access_mask);
3935         if(!NT_STATUS_IS_OK(status)) {
3936                 DEBUG(5,("mkdir_internal: check_parent_access "
3937                         "on directory %s for path %s returned %s\n",
3938                         parent_dir,
3939                         smb_dname->base_name,
3940                         nt_errstr(status) ));
3941                 return status;
3942         }
3943
3944         if (SMB_VFS_MKDIR(conn, smb_dname, mode) != 0) {
3945                 return map_nt_error_from_unix(errno);
3946         }
3947
3948         /* Ensure we're checking for a symlink here.... */
3949         /* We don't want to get caught by a symlink racer. */
3950
3951         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3952                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3953                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3954                 return map_nt_error_from_unix(errno);
3955         }
3956
3957         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
3958                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
3959                           smb_fname_str_dbg(smb_dname)));
3960                 return NT_STATUS_NOT_A_DIRECTORY;
3961         }
3962
3963         if (lp_store_dos_attributes(SNUM(conn))) {
3964                 if (!posix_open) {
3965                         file_set_dosmode(conn, smb_dname,
3966                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
3967                                          parent_dir, true);
3968                 }
3969         }
3970
3971         if (lp_inherit_permissions(SNUM(conn))) {
3972                 inherit_access_posix_acl(conn, parent_dir,
3973                                          smb_dname, mode);
3974                 need_re_stat = true;
3975         }
3976
3977         if (!posix_open) {
3978                 /*
3979                  * Check if high bits should have been set,
3980                  * then (if bits are missing): add them.
3981                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
3982                  * dir.
3983                  */
3984                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
3985                     (mode & ~smb_dname->st.st_ex_mode)) {
3986                         SMB_VFS_CHMOD(conn, smb_dname,
3987                                       (smb_dname->st.st_ex_mode |
3988                                           (mode & ~smb_dname->st.st_ex_mode)));
3989                         need_re_stat = true;
3990                 }
3991         }
3992
3993         /* Change the owner if required. */
3994         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
3995                 change_dir_owner_to_parent(conn, parent_dir,
3996                                            smb_dname,
3997                                            &smb_dname->st);
3998                 need_re_stat = true;
3999         }
4000
4001         if (need_re_stat) {
4002                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
4003                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
4004                           smb_fname_str_dbg(smb_dname), strerror(errno)));
4005                         return map_nt_error_from_unix(errno);
4006                 }
4007         }
4008
4009         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
4010                      smb_dname->base_name);
4011
4012         return NT_STATUS_OK;
4013 }
4014
4015 /****************************************************************************
4016  Open a directory from an NT SMB call.
4017 ****************************************************************************/
4018
4019 static NTSTATUS open_directory(connection_struct *conn,
4020                                struct smb_request *req,
4021                                struct smb_filename *smb_dname,
4022                                uint32_t access_mask,
4023                                uint32_t share_access,
4024                                uint32_t create_disposition,
4025                                uint32_t create_options,
4026                                uint32_t file_attributes,
4027                                int *pinfo,
4028                                files_struct **result)
4029 {
4030         files_struct *fsp = NULL;
4031         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
4032         struct share_mode_lock *lck = NULL;
4033         NTSTATUS status;
4034         struct timespec mtimespec;
4035         int info = 0;
4036         bool ok;
4037
4038         if (is_ntfs_stream_smb_fname(smb_dname)) {
4039                 DEBUG(2, ("open_directory: %s is a stream name!\n",
4040                           smb_fname_str_dbg(smb_dname)));
4041                 return NT_STATUS_NOT_A_DIRECTORY;
4042         }
4043
4044         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
4045                 /* Ensure we have a directory attribute. */
4046                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
4047         }
4048
4049         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
4050                  "share_access = 0x%x create_options = 0x%x, "
4051                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
4052                  smb_fname_str_dbg(smb_dname),
4053                  (unsigned int)access_mask,
4054                  (unsigned int)share_access,
4055                  (unsigned int)create_options,
4056                  (unsigned int)create_disposition,
4057                  (unsigned int)file_attributes));
4058
4059         status = smbd_calculate_access_mask(conn, smb_dname, false,
4060                                             access_mask, &access_mask);
4061         if (!NT_STATUS_IS_OK(status)) {
4062                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
4063                         "on file %s returned %s\n",
4064                         smb_fname_str_dbg(smb_dname),
4065                         nt_errstr(status)));
4066                 return status;
4067         }
4068
4069         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
4070                         !security_token_has_privilege(get_current_nttok(conn),
4071                                         SEC_PRIV_SECURITY)) {
4072                 DEBUG(10, ("open_directory: open on %s "
4073                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
4074                         smb_fname_str_dbg(smb_dname)));
4075                 return NT_STATUS_PRIVILEGE_NOT_HELD;
4076         }
4077
4078         switch( create_disposition ) {
4079                 case FILE_OPEN:
4080
4081                         if (!dir_existed) {
4082                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
4083                         }
4084
4085                         info = FILE_WAS_OPENED;
4086                         break;
4087
4088                 case FILE_CREATE:
4089
4090                         /* If directory exists error. If directory doesn't
4091                          * exist create. */
4092
4093                         if (dir_existed) {
4094                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
4095                                 DEBUG(2, ("open_directory: unable to create "
4096                                           "%s. Error was %s\n",
4097                                           smb_fname_str_dbg(smb_dname),
4098                                           nt_errstr(status)));
4099                                 return status;
4100                         }
4101
4102                         status = mkdir_internal(conn, smb_dname,
4103                                                 file_attributes);
4104
4105                         if (!NT_STATUS_IS_OK(status)) {
4106                                 DEBUG(2, ("open_directory: unable to create "
4107                                           "%s. Error was %s\n",
4108                                           smb_fname_str_dbg(smb_dname),
4109                                           nt_errstr(status)));
4110                                 return status;
4111                         }
4112
4113                         info = FILE_WAS_CREATED;
4114                         break;
4115
4116                 case FILE_OPEN_IF:
4117                         /*
4118                          * If directory exists open. If directory doesn't
4119                          * exist create.
4120                          */
4121
4122                         if (dir_existed) {
4123                                 status = NT_STATUS_OK;
4124                                 info = FILE_WAS_OPENED;
4125                         } else {
4126                                 status = mkdir_internal(conn, smb_dname,
4127                                                 file_attributes);
4128
4129                                 if (NT_STATUS_IS_OK(status)) {
4130                                         info = FILE_WAS_CREATED;
4131                                 } else {
4132                                         /* Cope with create race. */
4133                                         if (!NT_STATUS_EQUAL(status,
4134                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
4135                                                 DEBUG(2, ("open_directory: unable to create "
4136                                                         "%s. Error was %s\n",
4137                                                         smb_fname_str_dbg(smb_dname),
4138                                                         nt_errstr(status)));
4139                                                 return status;
4140                                         }
4141
4142                                         /*
4143                                          * If mkdir_internal() returned
4144                                          * NT_STATUS_OBJECT_NAME_COLLISION
4145                                          * we still must lstat the path.
4146                                          */
4147
4148                                         if (SMB_VFS_LSTAT(conn, smb_dname)
4149                                                         == -1) {
4150                                                 DEBUG(2, ("Could not stat "
4151                                                         "directory '%s' just "
4152                                                         "opened: %s\n",
4153                                                         smb_fname_str_dbg(
4154                                                                 smb_dname),
4155                                                         strerror(errno)));
4156                                                 return map_nt_error_from_unix(
4157                                                                 errno);
4158                                         }
4159
4160                                         info = FILE_WAS_OPENED;
4161                                 }
4162                         }
4163
4164                         break;
4165
4166                 case FILE_SUPERSEDE:
4167                 case FILE_OVERWRITE:
4168                 case FILE_OVERWRITE_IF:
4169                 default:
4170                         DEBUG(5,("open_directory: invalid create_disposition "
4171                                  "0x%x for directory %s\n",
4172                                  (unsigned int)create_disposition,
4173                                  smb_fname_str_dbg(smb_dname)));
4174                         return NT_STATUS_INVALID_PARAMETER;
4175         }
4176
4177         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
4178                 DEBUG(5,("open_directory: %s is not a directory !\n",
4179                          smb_fname_str_dbg(smb_dname)));
4180                 return NT_STATUS_NOT_A_DIRECTORY;
4181         }
4182
4183         if (info == FILE_WAS_OPENED) {
4184                 status = smbd_check_access_rights(conn,
4185                                                 smb_dname,
4186                                                 false,
4187                                                 access_mask);
4188                 if (!NT_STATUS_IS_OK(status)) {
4189                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
4190                                 "file %s failed with %s\n",
4191                                 smb_fname_str_dbg(smb_dname),
4192                                 nt_errstr(status)));
4193                         return status;
4194                 }
4195         }
4196
4197         status = file_new(req, conn, &fsp);
4198         if(!NT_STATUS_IS_OK(status)) {
4199                 return status;
4200         }
4201
4202         /*
4203          * Setup the files_struct for it.
4204          */
4205
4206         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
4207         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
4208         fsp->file_pid = req ? req->smbpid : 0;
4209         fsp->can_lock = False;
4210         fsp->can_read = False;
4211         fsp->can_write = False;
4212
4213         fsp->share_access = share_access;
4214         fsp->fh->private_options = 0;
4215         /*
4216          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
4217          */
4218         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
4219         fsp->print_file = NULL;
4220         fsp->modified = False;
4221         fsp->oplock_type = NO_OPLOCK;
4222         fsp->sent_oplock_break = NO_BREAK_SENT;
4223         fsp->is_directory = True;
4224         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
4225                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
4226         }
4227         status = fsp_set_smb_fname(fsp, smb_dname);
4228         if (!NT_STATUS_IS_OK(status)) {
4229                 file_free(req, fsp);
4230                 return status;
4231         }
4232
4233         /* Don't store old timestamps for directory
4234            handles in the internal database. We don't
4235            update them in there if new objects
4236            are creaded in the directory. Currently
4237            we only update timestamps on file writes.
4238            See bug #9870.
4239         */
4240         ZERO_STRUCT(mtimespec);
4241
4242         if (access_mask & (FILE_LIST_DIRECTORY|
4243                            FILE_ADD_FILE|
4244                            FILE_ADD_SUBDIRECTORY|
4245                            FILE_TRAVERSE|
4246                            DELETE_ACCESS|
4247                            FILE_DELETE_CHILD)) {
4248 #ifdef O_DIRECTORY
4249                 status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
4250 #else
4251                 /* POSIX allows us to open a directory with O_RDONLY. */
4252                 status = fd_open(conn, fsp, O_RDONLY, 0);
4253 #endif
4254                 if (!NT_STATUS_IS_OK(status)) {
4255                         DEBUG(5, ("open_directory: Could not open fd for "
4256                                 "%s (%s)\n",
4257                                 smb_fname_str_dbg(smb_dname),
4258                                 nt_errstr(status)));
4259                         file_free(req, fsp);
4260                         return status;
4261                 }
4262         } else {
4263                 fsp->fh->fd = -1;
4264                 DEBUG(10, ("Not opening Directory %s\n",
4265                         smb_fname_str_dbg(smb_dname)));
4266         }
4267
4268         status = vfs_stat_fsp(fsp);
4269         if (!NT_STATUS_IS_OK(status)) {
4270                 fd_close(fsp);
4271                 file_free(req, fsp);
4272                 return status;
4273         }
4274
4275         if(!S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
4276                 DEBUG(5,("open_directory: %s is not a directory !\n",
4277                          smb_fname_str_dbg(smb_dname)));
4278                 fd_close(fsp);
4279                 file_free(req, fsp);
4280                 return NT_STATUS_NOT_A_DIRECTORY;
4281         }
4282
4283         /* Ensure there was no race condition.  We need to check
4284          * dev/inode but not permissions, as these can change
4285          * legitimately */
4286         if (!check_same_dev_ino(&smb_dname->st, &fsp->fsp_name->st)) {
4287                 DEBUG(5,("open_directory: stat struct differs for "
4288                         "directory %s.\n",
4289                         smb_fname_str_dbg(smb_dname)));
4290                 fd_close(fsp);
4291                 file_free(req, fsp);
4292                 return NT_STATUS_ACCESS_DENIED;
4293         }
4294
4295         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
4296                                   conn->connectpath, smb_dname,
4297                                   &mtimespec);
4298
4299         if (lck == NULL) {
4300                 DEBUG(0, ("open_directory: Could not get share mode lock for "
4301                           "%s\n", smb_fname_str_dbg(smb_dname)));
4302                 fd_close(fsp);
4303                 file_free(req, fsp);
4304                 return NT_STATUS_SHARING_VIOLATION;
4305         }
4306
4307         if (has_delete_on_close(lck, fsp->name_hash)) {
4308                 TALLOC_FREE(lck);
4309                 fd_close(fsp);
4310                 file_free(req, fsp);
4311                 return NT_STATUS_DELETE_PENDING;
4312         }
4313
4314         status = open_mode_check(conn, lck,
4315                                  access_mask, share_access);
4316
4317         if (!NT_STATUS_IS_OK(status)) {
4318                 TALLOC_FREE(lck);
4319                 fd_close(fsp);
4320                 file_free(req, fsp);
4321                 return status;
4322         }
4323
4324         ok = set_share_mode(
4325                 lck,
4326                 fsp,
4327                 get_current_uid(conn),
4328                 req ? req->mid : 0,
4329                 NO_OPLOCK,
4330                 NULL,
4331                 NULL);
4332         if (!ok) {
4333                 TALLOC_FREE(lck);
4334                 fd_close(fsp);
4335                 file_free(req, fsp);
4336                 return NT_STATUS_NO_MEMORY;
4337         }
4338
4339         /* For directories the delete on close bit at open time seems
4340            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
4341         if (create_options & FILE_DELETE_ON_CLOSE) {
4342                 status = can_set_delete_on_close(fsp, 0);
4343                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
4344                         del_share_mode(lck, fsp);
4345                         TALLOC_FREE(lck);
4346                         fd_close(fsp);
4347                         file_free(req, fsp);
4348                         return status;
4349                 }
4350
4351                 if (NT_STATUS_IS_OK(status)) {
4352                         /* Note that here we set the *initial* delete on close flag,
4353                            not the regular one. The magic gets handled in close. */
4354                         fsp->initial_delete_on_close = True;
4355                 }
4356         }
4357
4358         {
4359                 /*
4360                  * Deal with other opens having a modified write time. Is this
4361                  * possible for directories?
4362                  */
4363                 struct timespec write_time = get_share_mode_write_time(lck);
4364
4365                 if (!null_timespec(write_time)) {
4366                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
4367                 }
4368         }
4369
4370         TALLOC_FREE(lck);
4371
4372         if (pinfo) {
4373                 *pinfo = info;
4374         }
4375
4376         *result = fsp;
4377         return NT_STATUS_OK;
4378 }
4379
4380 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
4381                           struct smb_filename *smb_dname)
4382 {
4383         NTSTATUS status;
4384         files_struct *fsp;
4385
4386         status = SMB_VFS_CREATE_FILE(
4387                 conn,                                   /* conn */
4388                 req,                                    /* req */
4389                 0,                                      /* root_dir_fid */
4390                 smb_dname,                              /* fname */
4391                 FILE_READ_ATTRIBUTES,                   /* access_mask */
4392                 FILE_SHARE_NONE,                        /* share_access */
4393                 FILE_CREATE,                            /* create_disposition*/
4394                 FILE_DIRECTORY_FILE,                    /* create_options */
4395                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
4396                 0,                                      /* oplock_request */
4397                 NULL,                                   /* lease */
4398                 0,                                      /* allocation_size */
4399                 0,                                      /* private_flags */
4400                 NULL,                                   /* sd */
4401                 NULL,                                   /* ea_list */
4402                 &fsp,                                   /* result */
4403                 NULL,                                   /* pinfo */
4404                 NULL, NULL);                            /* create context */
4405
4406         if (NT_STATUS_IS_OK(status)) {
4407                 close_file(req, fsp, NORMAL_CLOSE);
4408         }
4409
4410         return status;
4411 }
4412
4413 /****************************************************************************
4414  Receive notification that one of our open files has been renamed by another
4415  smbd process.
4416 ****************************************************************************/
4417
4418 void msg_file_was_renamed(struct messaging_context *msg_ctx,
4419                           void *private_data,
4420                           uint32_t msg_type,
4421                           struct server_id src,
4422                           DATA_BLOB *data)
4423 {
4424         struct file_rename_message *msg = NULL;
4425         enum ndr_err_code ndr_err;
4426         files_struct *fsp;
4427         struct smb_filename *smb_fname = NULL;
4428         struct smbd_server_connection *sconn =
4429                 talloc_get_type_abort(private_data,
4430                 struct smbd_server_connection);
4431
4432         msg = talloc(talloc_tos(), struct file_rename_message);
4433         if (msg == NULL) {
4434                 DBG_WARNING("talloc failed\n");
4435                 return;
4436         }
4437
4438         ndr_err = ndr_pull_struct_blob_all(
4439                 data,
4440                 msg,
4441                 msg,
4442                 (ndr_pull_flags_fn_t)ndr_pull_file_rename_message);
4443         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4444                 DBG_DEBUG("ndr_pull_oplock_break_message failed: %s\n",
4445                           ndr_errstr(ndr_err));
4446                 goto out;
4447         }
4448         if (DEBUGLEVEL >= 10) {
4449                 struct server_id_buf buf;
4450                 DBG_DEBUG("Got rename message from %s\n",
4451                           server_id_str_buf(src, &buf));
4452                 NDR_PRINT_DEBUG(file_rename_message, msg);
4453         }
4454
4455         /* stream_name must always be NULL if there is no stream. */
4456         if ((msg->stream_name != NULL) && (msg->stream_name[0] == '\0')) {
4457                 msg->stream_name = NULL;
4458         }
4459
4460         smb_fname = synthetic_smb_fname(
4461                 msg, msg->base_name, msg->stream_name, NULL, 0);
4462         if (smb_fname == NULL) {
4463                 DBG_DEBUG("synthetic_smb_fname failed\n");
4464                 goto out;
4465         }
4466
4467         fsp = file_find_dif(sconn, msg->id, msg->share_file_id);
4468         if (fsp == NULL) {
4469                 DBG_DEBUG("fsp not found\n");
4470                 goto out;
4471         }
4472
4473         if (strcmp(fsp->conn->connectpath, msg->servicepath) == 0) {
4474                 NTSTATUS status;
4475                 DBG_DEBUG("renaming file %s from %s -> %s\n",
4476                           fsp_fnum_dbg(fsp),
4477                           fsp_str_dbg(fsp),
4478                           smb_fname_str_dbg(smb_fname));
4479                 status = fsp_set_smb_fname(fsp, smb_fname);
4480                 if (!NT_STATUS_IS_OK(status)) {
4481                         DBG_DEBUG("fsp_set_smb_fname failed: %s\n",
4482                                   nt_errstr(status));
4483                 }
4484         } else {
4485                 /* TODO. JRA. */
4486                 /*
4487                  * Now we have the complete path we can work out if
4488                  * this is actually within this share and adjust
4489                  * newname accordingly.
4490                  */
4491                 DBG_DEBUG("share mismatch (sharepath %s not sharepath %s) "
4492                           "%s from %s -> %s\n",
4493                           fsp->conn->connectpath,
4494                           msg->servicepath,
4495                           fsp_fnum_dbg(fsp),
4496                           fsp_str_dbg(fsp),
4497                           smb_fname_str_dbg(smb_fname));
4498         }
4499  out:
4500         TALLOC_FREE(msg);
4501 }
4502
4503 /*
4504  * If a main file is opened for delete, all streams need to be checked for
4505  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
4506  * If that works, delete them all by setting the delete on close and close.
4507  */
4508
4509 static NTSTATUS open_streams_for_delete(connection_struct *conn,
4510                                         const struct smb_filename *smb_fname)
4511 {
4512         struct stream_struct *stream_info = NULL;
4513         files_struct **streams = NULL;
4514         int i;
4515         unsigned int num_streams = 0;
4516         TALLOC_CTX *frame = talloc_stackframe();
4517         NTSTATUS status;
4518
4519         status = vfs_streaminfo(conn, NULL, smb_fname, talloc_tos(),
4520                                 &num_streams, &stream_info);
4521
4522         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
4523             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
4524                 DEBUG(10, ("no streams around\n"));
4525                 TALLOC_FREE(frame);
4526                 return NT_STATUS_OK;
4527         }
4528
4529         if (!NT_STATUS_IS_OK(status)) {
4530                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
4531                            nt_errstr(status)));
4532                 goto fail;
4533         }
4534
4535         DEBUG(10, ("open_streams_for_delete found %d streams\n",
4536                    num_streams));
4537
4538         if (num_streams == 0) {
4539                 TALLOC_FREE(frame);
4540                 return NT_STATUS_OK;
4541         }
4542
4543         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
4544         if (streams == NULL) {
4545                 DEBUG(0, ("talloc failed\n"));
4546                 status = NT_STATUS_NO_MEMORY;
4547                 goto fail;
4548         }
4549
4550         for (i=0; i<num_streams; i++) {
4551                 struct smb_filename *smb_fname_cp;
4552
4553                 if (strequal(stream_info[i].name, "::$DATA")) {
4554                         streams[i] = NULL;
4555                         continue;
4556                 }
4557
4558                 smb_fname_cp = synthetic_smb_fname(talloc_tos(),
4559                                         smb_fname->base_name,
4560                                         stream_info[i].name,
4561                                         NULL,
4562                                         (smb_fname->flags &
4563                                                 ~SMB_FILENAME_POSIX_PATH));
4564                 if (smb_fname_cp == NULL) {
4565                         status = NT_STATUS_NO_MEMORY;
4566                         goto fail;
4567                 }
4568
4569                 if (SMB_VFS_STAT(conn, smb_fname_cp) == -1) {
4570                         DEBUG(10, ("Unable to stat stream: %s\n",
4571                                    smb_fname_str_dbg(smb_fname_cp)));
4572                 }
4573
4574                 status = SMB_VFS_CREATE_FILE(
4575                          conn,                  /* conn */
4576                          NULL,                  /* req */
4577                          0,                     /* root_dir_fid */
4578                          smb_fname_cp,          /* fname */
4579                          DELETE_ACCESS,         /* access_mask */
4580                          (FILE_SHARE_READ |     /* share_access */
4581                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
4582                          FILE_OPEN,             /* create_disposition*/
4583                          0,                     /* create_options */
4584                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
4585                          0,                     /* oplock_request */
4586                          NULL,                  /* lease */
4587                          0,                     /* allocation_size */
4588                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
4589                          NULL,                  /* sd */
4590                          NULL,                  /* ea_list */
4591                          &streams[i],           /* result */
4592                          NULL,                  /* pinfo */
4593                          NULL, NULL);           /* create context */
4594
4595                 if (!NT_STATUS_IS_OK(status)) {
4596                         DEBUG(10, ("Could not open stream %s: %s\n",
4597                                    smb_fname_str_dbg(smb_fname_cp),
4598                                    nt_errstr(status)));
4599
4600                         TALLOC_FREE(smb_fname_cp);
4601                         break;
4602                 }
4603                 TALLOC_FREE(smb_fname_cp);
4604         }
4605
4606         /*
4607          * don't touch the variable "status" beyond this point :-)
4608          */
4609
4610         for (i -= 1 ; i >= 0; i--) {
4611                 if (streams[i] == NULL) {
4612                         continue;
4613                 }
4614
4615                 DEBUG(10, ("Closing stream # %d, %s\n", i,
4616                            fsp_str_dbg(streams[i])));
4617                 close_file(NULL, streams[i], NORMAL_CLOSE);
4618         }
4619
4620  fail:
4621         TALLOC_FREE(frame);
4622         return status;
4623 }
4624
4625 /*********************************************************************
4626  Create a default ACL by inheriting from the parent. If no inheritance
4627  from the parent available, don't set anything. This will leave the actual
4628  permissions the new file or directory already got from the filesystem
4629  as the NT ACL when read.
4630 *********************************************************************/
4631
4632 static NTSTATUS inherit_new_acl(files_struct *fsp)
4633 {
4634         TALLOC_CTX *frame = talloc_stackframe();
4635         char *parent_name = NULL;
4636         struct security_descriptor *parent_desc = NULL;
4637         NTSTATUS status = NT_STATUS_OK;
4638         struct security_descriptor *psd = NULL;
4639         const struct dom_sid *owner_sid = NULL;
4640         const struct dom_sid *group_sid = NULL;
4641         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
4642         struct security_token *token = fsp->conn->session_info->security_token;
4643         bool inherit_owner =
4644             (lp_inherit_owner(SNUM(fsp->conn)) == INHERIT_OWNER_WINDOWS_AND_UNIX);
4645         bool inheritable_components = false;
4646         bool try_builtin_administrators = false;
4647         const struct dom_sid *BA_U_sid = NULL;
4648         const struct dom_sid *BA_G_sid = NULL;
4649         bool try_system = false;
4650         const struct dom_sid *SY_U_sid = NULL;
4651         const struct dom_sid *SY_G_sid = NULL;
4652         size_t size = 0;
4653         struct smb_filename *parent_smb_fname = NULL;
4654
4655         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
4656                 TALLOC_FREE(frame);
4657                 return NT_STATUS_NO_MEMORY;
4658         }
4659         parent_smb_fname = synthetic_smb_fname(talloc_tos(),
4660                                                 parent_name,
4661                                                 NULL,
4662                                                 NULL,
4663                                                 fsp->fsp_name->flags);
4664
4665         if (parent_smb_fname == NULL) {
4666                 TALLOC_FREE(frame);
4667                 return NT_STATUS_NO_MEMORY;
4668         }
4669
4670         status = SMB_VFS_GET_NT_ACL(fsp->conn,
4671                                     parent_smb_fname,
4672                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
4673                                     frame,
4674                                     &parent_desc);
4675         if (!NT_STATUS_IS_OK(status)) {
4676                 TALLOC_FREE(frame);
4677                 return status;
4678         }
4679
4680         inheritable_components = sd_has_inheritable_components(parent_desc,
4681                                         fsp->is_directory);
4682
4683         if (!inheritable_components && !inherit_owner) {
4684                 TALLOC_FREE(frame);
4685                 /* Nothing to inherit and not setting owner. */
4686                 return NT_STATUS_OK;
4687         }
4688
4689         /* Create an inherited descriptor from the parent. */
4690
4691         if (DEBUGLEVEL >= 10) {
4692                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
4693                         fsp_str_dbg(fsp) ));
4694                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
4695         }
4696
4697         /* Inherit from parent descriptor if "inherit owner" set. */
4698         if (inherit_owner) {
4699                 owner_sid = parent_desc->owner_sid;
4700                 group_sid = parent_desc->group_sid;
4701         }
4702
4703         if (owner_sid == NULL) {
4704                 if (security_token_has_builtin_administrators(token)) {
4705                         try_builtin_administrators = true;
4706                 } else if (security_token_is_system(token)) {
4707                         try_builtin_administrators = true;
4708                         try_system = true;
4709                 }
4710         }
4711
4712         if (group_sid == NULL &&
4713             token->num_sids == PRIMARY_GROUP_SID_INDEX)
4714         {
4715                 if (security_token_is_system(token)) {
4716                         try_builtin_administrators = true;
4717                         try_system = true;
4718                 }
4719         }
4720
4721         if (try_builtin_administrators) {
4722                 struct unixid ids;
4723                 bool ok;
4724
4725                 ZERO_STRUCT(ids);
4726                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
4727                 if (ok) {
4728                         switch (ids.type) {
4729                         case ID_TYPE_BOTH:
4730                                 BA_U_sid = &global_sid_Builtin_Administrators;
4731                                 BA_G_sid = &global_sid_Builtin_Administrators;
4732                                 break;
4733                         case ID_TYPE_UID:
4734                                 BA_U_sid = &global_sid_Builtin_Administrators;
4735                                 break;
4736                         case ID_TYPE_GID:
4737                                 BA_G_sid = &global_sid_Builtin_Administrators;
4738                                 break;
4739                         default:
4740                                 break;
4741                         }
4742                 }
4743         }
4744
4745         if (try_system) {
4746                 struct unixid ids;
4747                 bool ok;
4748
4749                 ZERO_STRUCT(ids);
4750                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
4751                 if (ok) {
4752                         switch (ids.type) {
4753                         case ID_TYPE_BOTH:
4754                                 SY_U_sid = &global_sid_System;
4755                                 SY_G_sid = &global_sid_System;
4756                                 break;
4757                         case ID_TYPE_UID:
4758                                 SY_U_sid = &global_sid_System;
4759                                 break;
4760                         case ID_TYPE_GID:
4761                                 SY_G_sid = &global_sid_System;
4762                                 break;
4763                         default:
4764                                 break;
4765                         }
4766                 }
4767         }
4768
4769         if (owner_sid == NULL) {
4770                 owner_sid = BA_U_sid;
4771         }
4772
4773         if (owner_sid == NULL) {
4774                 owner_sid = SY_U_sid;
4775         }
4776
4777         if (group_sid == NULL) {
4778                 group_sid = SY_G_sid;
4779         }
4780
4781         if (try_system && group_sid == NULL) {
4782                 group_sid = BA_G_sid;
4783         }
4784
4785         if (owner_sid == NULL) {
4786                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4787         }
4788         if (group_sid == NULL) {
4789                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
4790                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4791                 } else {
4792                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
4793                 }
4794         }
4795
4796         status = se_create_child_secdesc(frame,
4797                         &psd,
4798                         &size,
4799                         parent_desc,
4800                         owner_sid,
4801                         group_sid,
4802                         fsp->is_directory);
4803         if (!NT_STATUS_IS_OK(status)) {
4804                 TALLOC_FREE(frame);
4805                 return status;
4806         }
4807
4808         /* If inheritable_components == false,
4809            se_create_child_secdesc()
4810            creates a security descriptor with a NULL dacl
4811            entry, but with SEC_DESC_DACL_PRESENT. We need
4812            to remove that flag. */
4813
4814         if (!inheritable_components) {
4815                 security_info_sent &= ~SECINFO_DACL;
4816                 psd->type &= ~SEC_DESC_DACL_PRESENT;
4817         }
4818
4819         if (DEBUGLEVEL >= 10) {
4820                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
4821                         fsp_str_dbg(fsp) ));
4822                 NDR_PRINT_DEBUG(security_descriptor, psd);
4823         }
4824
4825         if (inherit_owner) {
4826                 /* We need to be root to force this. */
4827                 become_root();
4828         }
4829         status = SMB_VFS_FSET_NT_ACL(fsp,
4830                         security_info_sent,
4831                         psd);
4832         if (inherit_owner) {
4833                 unbecome_root();
4834         }
4835         TALLOC_FREE(frame);
4836         return status;
4837 }
4838
4839 /*
4840  * If we already have a lease, it must match the new file id. [MS-SMB2]
4841  * 3.3.5.9.8 speaks about INVALID_PARAMETER if an already used lease key is
4842  * used for a different file name.
4843  */
4844
4845 struct lease_match_state {
4846         /* Input parameters. */
4847         TALLOC_CTX *mem_ctx;
4848         const char *servicepath;
4849         const struct smb_filename *fname;
4850         bool file_existed;
4851         struct file_id id;
4852         /* Return parameters. */
4853         uint32_t num_file_ids;
4854         struct file_id *ids;
4855         NTSTATUS match_status;
4856 };
4857
4858 /*************************************************************
4859  File doesn't exist but this lease key+guid is already in use.
4860
4861  This is only allowable in the dynamic share case where the
4862  service path must be different.
4863
4864  There is a small race condition here in the multi-connection
4865  case where a client sends two create calls on different connections,
4866  where the file doesn't exist and one smbd creates the leases_db
4867  entry first, but this will get fixed by the multichannel cleanup
4868  when all identical client_guids get handled by a single smbd.
4869 **************************************************************/
4870
4871 static void lease_match_parser_new_file(
4872         uint32_t num_files,
4873         const struct leases_db_file *files,
4874         struct lease_match_state *state)
4875 {
4876         uint32_t i;
4877
4878         for (i = 0; i < num_files; i++) {
4879                 const struct leases_db_file *f = &files[i];
4880                 if (strequal(state->servicepath, f->servicepath)) {
4881                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4882                         return;
4883                 }
4884         }
4885
4886         /* Dynamic share case. Break leases on all other files. */
4887         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4888                                         num_files,
4889                                         files,
4890                                         &state->ids);
4891         if (!NT_STATUS_IS_OK(state->match_status)) {
4892                 return;
4893         }
4894
4895         state->num_file_ids = num_files;
4896         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4897         return;
4898 }
4899
4900 static void lease_match_parser(
4901         uint32_t num_files,
4902         const struct leases_db_file *files,
4903         void *private_data)
4904 {
4905         struct lease_match_state *state =
4906                 (struct lease_match_state *)private_data;
4907         uint32_t i;
4908
4909         if (!state->file_existed) {
4910                 /*
4911                  * Deal with name mismatch or
4912                  * possible dynamic share case separately
4913                  * to make code clearer.
4914                  */
4915                 lease_match_parser_new_file(num_files,
4916                                                 files,
4917                                                 state);
4918                 return;
4919         }
4920
4921         /* File existed. */
4922         state->match_status = NT_STATUS_OK;
4923
4924         for (i = 0; i < num_files; i++) {
4925                 const struct leases_db_file *f = &files[i];
4926
4927                 /* Everything should be the same. */
4928                 if (!file_id_equal(&state->id, &f->id)) {
4929                         /* This should catch all dynamic share cases. */
4930                         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4931                         break;
4932                 }
4933                 if (!strequal(f->servicepath, state->servicepath)) {
4934                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4935                         break;
4936                 }
4937                 if (!strequal(f->base_name, state->fname->base_name)) {
4938                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4939                         break;
4940                 }
4941                 if (!strequal(f->stream_name, state->fname->stream_name)) {
4942                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4943                         break;
4944                 }
4945         }
4946
4947         if (NT_STATUS_IS_OK(state->match_status)) {
4948                 /*
4949                  * Common case - just opening another handle on a
4950                  * file on a non-dynamic share.
4951                  */
4952                 return;
4953         }
4954
4955         if (NT_STATUS_EQUAL(state->match_status, NT_STATUS_INVALID_PARAMETER)) {
4956                 /* Mismatched path. Error back to client. */
4957                 return;
4958         }
4959
4960         /*
4961          * File id mismatch. Dynamic share case NT_STATUS_OPLOCK_NOT_GRANTED.
4962          * Don't allow leases.
4963          */
4964
4965         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4966                                         num_files,
4967                                         files,
4968                                         &state->ids);
4969         if (!NT_STATUS_IS_OK(state->match_status)) {
4970                 return;
4971         }
4972
4973         state->num_file_ids = num_files;
4974         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4975         return;
4976 }
4977
4978 static NTSTATUS lease_match(connection_struct *conn,
4979                             struct smb_request *req,
4980                             struct smb2_lease_key *lease_key,
4981                             const char *servicepath,
4982                             const struct smb_filename *fname,
4983                             uint16_t *p_version,
4984                             uint16_t *p_epoch)
4985 {
4986         struct smbd_server_connection *sconn = req->sconn;
4987         TALLOC_CTX *tos = talloc_tos();
4988         struct lease_match_state state = {
4989                 .mem_ctx = tos,
4990                 .servicepath = servicepath,
4991                 .fname = fname,
4992                 .match_status = NT_STATUS_OK
4993         };
4994         uint32_t i;
4995         NTSTATUS status;
4996
4997         state.file_existed = VALID_STAT(fname->st);
4998         if (state.file_existed) {
4999                 state.id = vfs_file_id_from_sbuf(conn, &fname->st);
5000         }
5001
5002         status = leases_db_parse(&sconn->client->connections->smb2.client.guid,
5003                                  lease_key, lease_match_parser, &state);
5004         if (!NT_STATUS_IS_OK(status)) {
5005                 /*
5006                  * Not found or error means okay: We can make the lease pass
5007                  */
5008                 return NT_STATUS_OK;
5009         }
5010         if (!NT_STATUS_EQUAL(state.match_status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5011                 /*
5012                  * Anything but NT_STATUS_OPLOCK_NOT_GRANTED, let the caller
5013                  * deal with it.
5014                  */
5015                 return state.match_status;
5016         }
5017
5018         /* We have to break all existing leases. */
5019         for (i = 0; i < state.num_file_ids; i++) {
5020                 struct share_mode_lock *lck;
5021                 struct share_mode_data *d;
5022                 struct share_mode_entry *lease_entry = NULL;
5023                 uint32_t j;
5024
5025                 if (file_id_equal(&state.ids[i], &state.id)) {
5026                         /* Don't need to break our own file. */
5027                         continue;
5028                 }
5029
5030                 lck = get_existing_share_mode_lock(talloc_tos(), state.ids[i]);
5031                 if (lck == NULL) {
5032                         /* Race condition - file already closed. */
5033                         continue;
5034                 }
5035                 d = lck->data;
5036                 for (j=0; j<d->num_share_modes; j++) {
5037                         struct share_mode_entry *e = &d->share_modes[j];
5038                         uint32_t e_lease_type = get_lease_type(d, e);
5039
5040                         if (share_mode_stale_pid(d, j)) {
5041                                 continue;
5042                         }
5043
5044                         if (e->op_type == LEASE_OPLOCK) {
5045                                 if (!smb2_lease_key_equal(&e->lease_key,
5046                                                           lease_key)) {
5047                                         continue;
5048                                 }
5049                                 lease_entry = e;
5050                         }
5051
5052                         if (e_lease_type == SMB2_LEASE_NONE) {
5053                                 continue;
5054                         }
5055
5056                         send_break_message(conn->sconn->msg_ctx, &d->id, e,
5057                                            SMB2_LEASE_NONE);
5058
5059                         /*
5060                          * Windows 7 and 8 lease clients
5061                          * are broken in that they will not
5062                          * respond to lease break requests
5063                          * whilst waiting for an outstanding
5064                          * open request on that lease handle
5065                          * on the same TCP connection, due
5066                          * to holding an internal inode lock.
5067                          *
5068                          * This means we can't reschedule
5069                          * ourselves here, but must return
5070                          * from the create.
5071                          *
5072                          * Work around:
5073                          *
5074                          * Send the breaks and then return
5075                          * SMB2_LEASE_NONE in the lease handle
5076                          * to cause them to acknowledge the
5077                          * lease break. Consultation with
5078                          * Microsoft engineering confirmed
5079                          * this approach is safe.
5080                          */
5081
5082                 }
5083
5084                 if (lease_entry != NULL) {
5085                         status = leases_db_get(
5086                                 &lease_entry->client_guid,
5087                                 &lease_entry->lease_key,
5088                                 &d->id,
5089                                 NULL, /* current_state */
5090                                 NULL, /* breaking */
5091                                 NULL, /* breaking_to_requested */
5092                                 NULL, /* breaking_to_required */
5093                                 p_version, /* lease_version */
5094                                 p_epoch); /* epoch */
5095                         if (!NT_STATUS_IS_OK(status)) {
5096                                 DBG_WARNING("Could not find version/epoch: "
5097                                             "%s\n",
5098                                             nt_errstr(status));
5099                         }
5100                 }
5101
5102                 TALLOC_FREE(lck);
5103         }
5104         /*
5105          * Ensure we don't grant anything more so we
5106          * never upgrade.
5107          */
5108         return NT_STATUS_OPLOCK_NOT_GRANTED;
5109 }
5110
5111 /*
5112  * Wrapper around open_file_ntcreate and open_directory
5113  */
5114
5115 static NTSTATUS create_file_unixpath(connection_struct *conn,
5116                                      struct smb_request *req,
5117                                      struct smb_filename *smb_fname,
5118                                      uint32_t access_mask,
5119                                      uint32_t share_access,
5120                                      uint32_t create_disposition,
5121                                      uint32_t create_options,
5122                                      uint32_t file_attributes,
5123                                      uint32_t oplock_request,
5124                                      struct smb2_lease *lease,
5125                                      uint64_t allocation_size,
5126                                      uint32_t private_flags,
5127                                      struct security_descriptor *sd,
5128                                      struct ea_list *ea_list,
5129
5130                                      files_struct **result,
5131                                      int *pinfo)
5132 {
5133         int info = FILE_WAS_OPENED;
5134         files_struct *base_fsp = NULL;
5135         files_struct *fsp = NULL;
5136         NTSTATUS status;
5137
5138         DBG_DEBUG("create_file_unixpath: access_mask = 0x%x "
5139                   "file_attributes = 0x%x, share_access = 0x%x, "
5140                   "create_disposition = 0x%x create_options = 0x%x "
5141                   "oplock_request = 0x%x private_flags = 0x%x "
5142                   "ea_list = %p, sd = %p, "
5143                   "fname = %s\n",
5144                   (unsigned int)access_mask,
5145                   (unsigned int)file_attributes,
5146                   (unsigned int)share_access,
5147                   (unsigned int)create_disposition,
5148                   (unsigned int)create_options,
5149                   (unsigned int)oplock_request,
5150                   (unsigned int)private_flags,
5151                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5152
5153         if (create_options & FILE_OPEN_BY_FILE_ID) {
5154                 status = NT_STATUS_NOT_SUPPORTED;
5155                 goto fail;
5156         }
5157
5158         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
5159                 status = NT_STATUS_INVALID_PARAMETER;
5160                 goto fail;
5161         }
5162
5163         if (req == NULL) {
5164                 oplock_request |= INTERNAL_OPEN_ONLY;
5165         }
5166
5167         if (lease != NULL) {
5168                 uint16_t epoch = lease->lease_epoch;
5169                 uint16_t version = lease->lease_version;
5170
5171                 if (req == NULL) {
5172                         DBG_WARNING("Got lease on internal open\n");
5173                         status = NT_STATUS_INTERNAL_ERROR;
5174                         goto fail;
5175                 }
5176
5177                 status = lease_match(conn,
5178                                 req,
5179                                 &lease->lease_key,
5180                                 conn->connectpath,
5181                                 smb_fname,
5182                                 &version,
5183                                 &epoch);
5184                 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5185                         /* Dynamic share file. No leases and update epoch... */
5186                         lease->lease_state = SMB2_LEASE_NONE;
5187                         lease->lease_epoch = epoch;
5188                         lease->lease_version = version;
5189                 } else if (!NT_STATUS_IS_OK(status)) {
5190                         goto fail;
5191                 }
5192         }
5193
5194         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5195             && (access_mask & DELETE_ACCESS)
5196             && !is_ntfs_stream_smb_fname(smb_fname)) {
5197                 /*
5198                  * We can't open a file with DELETE access if any of the
5199                  * streams is open without FILE_SHARE_DELETE
5200                  */
5201                 status = open_streams_for_delete(conn, smb_fname);
5202
5203                 if (!NT_STATUS_IS_OK(status)) {
5204                         goto fail;
5205                 }
5206         }
5207
5208         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
5209                         !security_token_has_privilege(get_current_nttok(conn),
5210                                         SEC_PRIV_SECURITY)) {
5211                 DEBUG(10, ("create_file_unixpath: open on %s "
5212                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
5213                         smb_fname_str_dbg(smb_fname)));
5214                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
5215                 goto fail;
5216         }
5217
5218         /*
5219          * Files or directories can't be opened DELETE_ON_CLOSE without
5220          * delete access.
5221          * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13358
5222          */
5223         if (create_options & FILE_DELETE_ON_CLOSE) {
5224                 if ((access_mask & DELETE_ACCESS) == 0) {
5225                         status = NT_STATUS_INVALID_PARAMETER;
5226                         goto fail;
5227                 }
5228         }
5229
5230         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5231             && is_ntfs_stream_smb_fname(smb_fname)
5232             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
5233                 uint32_t base_create_disposition;
5234                 struct smb_filename *smb_fname_base = NULL;
5235                 uint32_t base_privflags;
5236
5237                 if (create_options & FILE_DIRECTORY_FILE) {
5238                         status = NT_STATUS_NOT_A_DIRECTORY;
5239                         goto fail;
5240                 }
5241
5242                 switch (create_disposition) {
5243                 case FILE_OPEN:
5244                         base_create_disposition = FILE_OPEN;
5245                         break;
5246                 default:
5247                         base_create_disposition = FILE_OPEN_IF;
5248                         break;
5249                 }
5250
5251                 /* Create an smb_filename with stream_name == NULL. */
5252                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
5253                                                 smb_fname->base_name,
5254                                                 NULL,
5255                                                 NULL,
5256                                                 smb_fname->flags);
5257                 if (smb_fname_base == NULL) {
5258                         status = NT_STATUS_NO_MEMORY;
5259                         goto fail;
5260                 }
5261
5262                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
5263                         DEBUG(10, ("Unable to stat stream: %s\n",
5264                                    smb_fname_str_dbg(smb_fname_base)));
5265                 } else {
5266                         /*
5267                          * https://bugzilla.samba.org/show_bug.cgi?id=10229
5268                          * We need to check if the requested access mask
5269                          * could be used to open the underlying file (if
5270                          * it existed), as we're passing in zero for the
5271                          * access mask to the base filename.
5272                          */
5273                         status = check_base_file_access(conn,
5274                                                         smb_fname_base,
5275                                                         access_mask);
5276
5277                         if (!NT_STATUS_IS_OK(status)) {
5278                                 DEBUG(10, ("Permission check "
5279                                         "for base %s failed: "
5280                                         "%s\n", smb_fname->base_name,
5281                                         nt_errstr(status)));
5282                                 goto fail;
5283                         }
5284                 }
5285
5286                 base_privflags = NTCREATEX_OPTIONS_PRIVATE_STREAM_BASEOPEN;
5287
5288                 /* Open the base file. */
5289                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
5290                                               FILE_SHARE_READ
5291                                               | FILE_SHARE_WRITE
5292                                               | FILE_SHARE_DELETE,
5293                                               base_create_disposition,
5294                                               0, 0, 0, NULL, 0,
5295                                               base_privflags,
5296                                               NULL, NULL,
5297                                               &base_fsp, NULL);
5298                 TALLOC_FREE(smb_fname_base);
5299
5300                 if (!NT_STATUS_IS_OK(status)) {
5301                         DEBUG(10, ("create_file_unixpath for base %s failed: "
5302                                    "%s\n", smb_fname->base_name,
5303                                    nt_errstr(status)));
5304                         goto fail;
5305                 }
5306                 /* we don't need the low level fd */
5307                 fd_close(base_fsp);
5308         }
5309
5310         /*
5311          * If it's a request for a directory open, deal with it separately.
5312          */
5313
5314         if (create_options & FILE_DIRECTORY_FILE) {
5315
5316                 if (create_options & FILE_NON_DIRECTORY_FILE) {
5317                         status = NT_STATUS_INVALID_PARAMETER;
5318                         goto fail;
5319                 }
5320
5321                 /* Can't open a temp directory. IFS kit test. */
5322                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
5323                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
5324                         status = NT_STATUS_INVALID_PARAMETER;
5325                         goto fail;
5326                 }
5327
5328                 /*
5329                  * We will get a create directory here if the Win32
5330                  * app specified a security descriptor in the
5331                  * CreateDirectory() call.
5332                  */
5333
5334                 oplock_request = 0;
5335                 status = open_directory(
5336                         conn, req, smb_fname, access_mask, share_access,
5337                         create_disposition, create_options, file_attributes,
5338                         &info, &fsp);
5339         } else {
5340
5341                 /*
5342                  * Ordinary file case.
5343                  */
5344
5345                 status = file_new(req, conn, &fsp);
5346                 if(!NT_STATUS_IS_OK(status)) {
5347                         goto fail;
5348                 }
5349
5350                 status = fsp_set_smb_fname(fsp, smb_fname);
5351                 if (!NT_STATUS_IS_OK(status)) {
5352                         goto fail;
5353                 }
5354
5355                 if (base_fsp) {
5356                         /*
5357                          * We're opening the stream element of a
5358                          * base_fsp we already opened. Set up the
5359                          * base_fsp pointer.
5360                          */
5361                         fsp->base_fsp = base_fsp;
5362                 }
5363
5364                 if (allocation_size) {
5365                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
5366                                                         allocation_size);
5367                 }
5368
5369                 status = open_file_ntcreate(conn,
5370                                             req,
5371                                             access_mask,
5372                                             share_access,
5373                                             create_disposition,
5374                                             create_options,
5375                                             file_attributes,
5376                                             oplock_request,
5377                                             lease,
5378                                             private_flags,
5379                                             &info,
5380                                             fsp);
5381
5382                 if(!NT_STATUS_IS_OK(status)) {
5383                         file_free(req, fsp);
5384                         fsp = NULL;
5385                 }
5386
5387                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
5388
5389                         /* A stream open never opens a directory */
5390
5391                         if (base_fsp) {
5392                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5393                                 goto fail;
5394                         }
5395
5396                         /*
5397                          * Fail the open if it was explicitly a non-directory
5398                          * file.
5399                          */
5400
5401                         if (create_options & FILE_NON_DIRECTORY_FILE) {
5402                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5403                                 goto fail;
5404                         }
5405
5406                         oplock_request = 0;
5407                         status = open_directory(
5408                                 conn, req, smb_fname, access_mask,
5409                                 share_access, create_disposition,
5410                                 create_options, file_attributes,
5411                                 &info, &fsp);
5412                 }
5413         }
5414
5415         if (!NT_STATUS_IS_OK(status)) {
5416                 goto fail;
5417         }
5418
5419         fsp->base_fsp = base_fsp;
5420
5421         if ((ea_list != NULL) &&
5422             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
5423                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
5424                 if (!NT_STATUS_IS_OK(status)) {
5425                         goto fail;
5426                 }
5427         }
5428
5429         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
5430                 status = NT_STATUS_ACCESS_DENIED;
5431                 goto fail;
5432         }
5433
5434         /* Save the requested allocation size. */
5435         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
5436                 if ((allocation_size > fsp->fsp_name->st.st_ex_size)
5437                     && !(fsp->is_directory))
5438                 {
5439                         fsp->initial_allocation_size = smb_roundup(
5440                                 fsp->conn, allocation_size);
5441                         if (vfs_allocate_file_space(
5442                                     fsp, fsp->initial_allocation_size) == -1) {
5443                                 status = NT_STATUS_DISK_FULL;
5444                                 goto fail;
5445                         }
5446                 } else {
5447                         fsp->initial_allocation_size = smb_roundup(
5448                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
5449                 }
5450         } else {
5451                 fsp->initial_allocation_size = 0;
5452         }
5453
5454         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
5455                                 fsp->base_fsp == NULL) {
5456                 if (sd != NULL) {
5457                         /*
5458                          * According to the MS documentation, the only time the security
5459                          * descriptor is applied to the opened file is iff we *created* the
5460                          * file; an existing file stays the same.
5461                          *
5462                          * Also, it seems (from observation) that you can open the file with
5463                          * any access mask but you can still write the sd. We need to override
5464                          * the granted access before we call set_sd
5465                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
5466                          */
5467
5468                         uint32_t sec_info_sent;
5469                         uint32_t saved_access_mask = fsp->access_mask;
5470
5471                         sec_info_sent = get_sec_info(sd);
5472
5473                         fsp->access_mask = FILE_GENERIC_ALL;
5474
5475                         if (sec_info_sent & (SECINFO_OWNER|
5476                                                 SECINFO_GROUP|
5477                                                 SECINFO_DACL|
5478                                                 SECINFO_SACL)) {
5479                                 status = set_sd(fsp, sd, sec_info_sent);
5480                         }
5481
5482                         fsp->access_mask = saved_access_mask;
5483
5484                         if (!NT_STATUS_IS_OK(status)) {
5485                                 goto fail;
5486                         }
5487                 } else if (lp_inherit_acls(SNUM(conn))) {
5488                         /* Inherit from parent. Errors here are not fatal. */
5489                         status = inherit_new_acl(fsp);
5490                         if (!NT_STATUS_IS_OK(status)) {
5491                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
5492                                         fsp_str_dbg(fsp),
5493                                         nt_errstr(status) ));
5494                         }
5495                 }
5496         }
5497
5498         if ((conn->fs_capabilities & FILE_FILE_COMPRESSION)
5499          && (create_options & FILE_NO_COMPRESSION)
5500          && (info == FILE_WAS_CREATED)) {
5501                 status = SMB_VFS_SET_COMPRESSION(conn, fsp, fsp,
5502                                                  COMPRESSION_FORMAT_NONE);
5503                 if (!NT_STATUS_IS_OK(status)) {
5504                         DEBUG(1, ("failed to disable compression: %s\n",
5505                                   nt_errstr(status)));
5506                 }
5507         }
5508
5509         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
5510
5511         *result = fsp;
5512         if (pinfo != NULL) {
5513                 *pinfo = info;
5514         }
5515
5516         smb_fname->st = fsp->fsp_name->st;
5517
5518         return NT_STATUS_OK;
5519
5520  fail:
5521         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
5522
5523         if (fsp != NULL) {
5524                 if (base_fsp && fsp->base_fsp == base_fsp) {
5525                         /*
5526                          * The close_file below will close
5527                          * fsp->base_fsp.
5528                          */
5529                         base_fsp = NULL;
5530                 }
5531                 close_file(req, fsp, ERROR_CLOSE);
5532                 fsp = NULL;
5533         }
5534         if (base_fsp != NULL) {
5535                 close_file(req, base_fsp, ERROR_CLOSE);
5536                 base_fsp = NULL;
5537         }
5538         return status;
5539 }
5540
5541 /*
5542  * Calculate the full path name given a relative fid.
5543  */
5544 NTSTATUS get_relative_fid_filename(connection_struct *conn,
5545                                    struct smb_request *req,
5546                                    uint16_t root_dir_fid,
5547                                    const struct smb_filename *smb_fname,
5548                                    struct smb_filename **smb_fname_out)
5549 {
5550         files_struct *dir_fsp;
5551         char *parent_fname = NULL;
5552         char *new_base_name = NULL;
5553         uint32_t ucf_flags = ucf_flags_from_smb_request(req);
5554         NTSTATUS status;
5555
5556         if (root_dir_fid == 0 || !smb_fname) {
5557                 status = NT_STATUS_INTERNAL_ERROR;
5558                 goto out;
5559         }
5560
5561         dir_fsp = file_fsp(req, root_dir_fid);
5562
5563         if (dir_fsp == NULL) {
5564                 status = NT_STATUS_INVALID_HANDLE;
5565                 goto out;
5566         }
5567
5568         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
5569                 status = NT_STATUS_INVALID_HANDLE;
5570                 goto out;
5571         }
5572
5573         if (!dir_fsp->is_directory) {
5574
5575                 /*
5576                  * Check to see if this is a mac fork of some kind.
5577                  */
5578
5579                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
5580                     is_ntfs_stream_smb_fname(smb_fname)) {
5581                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
5582                         goto out;
5583                 }
5584
5585                 /*
5586                   we need to handle the case when we get a
5587                   relative open relative to a file and the
5588                   pathname is blank - this is a reopen!
5589                   (hint from demyn plantenberg)
5590                 */
5591
5592                 status = NT_STATUS_INVALID_HANDLE;
5593                 goto out;
5594         }
5595
5596         if (ISDOT(dir_fsp->fsp_name->base_name)) {
5597                 /*
5598                  * We're at the toplevel dir, the final file name
5599                  * must not contain ./, as this is filtered out
5600                  * normally by srvstr_get_path and unix_convert
5601                  * explicitly rejects paths containing ./.
5602                  */
5603                 parent_fname = talloc_strdup(talloc_tos(), "");
5604                 if (parent_fname == NULL) {
5605                         status = NT_STATUS_NO_MEMORY;
5606                         goto out;
5607                 }
5608         } else {
5609                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
5610
5611                 /*
5612                  * Copy in the base directory name.
5613                  */
5614
5615                 parent_fname = talloc_array(talloc_tos(), char,
5616                     dir_name_len+2);
5617                 if (parent_fname == NULL) {
5618                         status = NT_STATUS_NO_MEMORY;
5619                         goto out;
5620                 }
5621                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
5622                     dir_name_len+1);
5623
5624                 /*
5625                  * Ensure it ends in a '/'.
5626                  * We used TALLOC_SIZE +2 to add space for the '/'.
5627                  */
5628
5629                 if(dir_name_len
5630                     && (parent_fname[dir_name_len-1] != '\\')
5631                     && (parent_fname[dir_name_len-1] != '/')) {
5632                         parent_fname[dir_name_len] = '/';
5633                         parent_fname[dir_name_len+1] = '\0';
5634                 }
5635         }
5636
5637         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
5638                                         smb_fname->base_name);
5639         if (new_base_name == NULL) {
5640                 status = NT_STATUS_NO_MEMORY;
5641                 goto out;
5642         }
5643
5644         status = filename_convert(req,
5645                                 conn,
5646                                 new_base_name,
5647                                 ucf_flags,
5648                                 NULL,
5649                                 NULL,
5650                                 smb_fname_out);
5651         if (!NT_STATUS_IS_OK(status)) {
5652                 goto out;
5653         }
5654
5655  out:
5656         TALLOC_FREE(parent_fname);
5657         TALLOC_FREE(new_base_name);
5658         return status;
5659 }
5660
5661 NTSTATUS create_file_default(connection_struct *conn,
5662                              struct smb_request *req,
5663                              uint16_t root_dir_fid,
5664                              struct smb_filename *smb_fname,
5665                              uint32_t access_mask,
5666                              uint32_t share_access,
5667                              uint32_t create_disposition,
5668                              uint32_t create_options,
5669                              uint32_t file_attributes,
5670                              uint32_t oplock_request,
5671                              struct smb2_lease *lease,
5672                              uint64_t allocation_size,
5673                              uint32_t private_flags,
5674                              struct security_descriptor *sd,
5675                              struct ea_list *ea_list,
5676                              files_struct **result,
5677                              int *pinfo,
5678                              const struct smb2_create_blobs *in_context_blobs,
5679                              struct smb2_create_blobs *out_context_blobs)
5680 {
5681         int info = FILE_WAS_OPENED;
5682         files_struct *fsp = NULL;
5683         NTSTATUS status;
5684         bool stream_name = false;
5685
5686         DBG_DEBUG("create_file: access_mask = 0x%x "
5687                   "file_attributes = 0x%x, share_access = 0x%x, "
5688                   "create_disposition = 0x%x create_options = 0x%x "
5689                   "oplock_request = 0x%x "
5690                   "private_flags = 0x%x "
5691                   "root_dir_fid = 0x%x, ea_list = %p, sd = %p, "
5692                   "fname = %s\n",
5693                   (unsigned int)access_mask,
5694                   (unsigned int)file_attributes,
5695                   (unsigned int)share_access,
5696                   (unsigned int)create_disposition,
5697                   (unsigned int)create_options,
5698                   (unsigned int)oplock_request,
5699                   (unsigned int)private_flags,
5700                   (unsigned int)root_dir_fid,
5701                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5702
5703         /*
5704          * Calculate the filename from the root_dir_if if necessary.
5705          */
5706
5707         if (root_dir_fid != 0) {
5708                 struct smb_filename *smb_fname_out = NULL;
5709                 status = get_relative_fid_filename(conn, req, root_dir_fid,
5710                                                    smb_fname, &smb_fname_out);
5711                 if (!NT_STATUS_IS_OK(status)) {
5712                         goto fail;
5713                 }
5714                 smb_fname = smb_fname_out;
5715         }
5716
5717         /*
5718          * Check to see if this is a mac fork of some kind.
5719          */
5720
5721         stream_name = is_ntfs_stream_smb_fname(smb_fname);
5722         if (stream_name) {
5723                 enum FAKE_FILE_TYPE fake_file_type;
5724
5725                 fake_file_type = is_fake_file(smb_fname);
5726
5727                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
5728
5729                         /*
5730                          * Here we go! support for changing the disk quotas
5731                          * --metze
5732                          *
5733                          * We need to fake up to open this MAGIC QUOTA file
5734                          * and return a valid FID.
5735                          *
5736                          * w2k close this file directly after openening xp
5737                          * also tries a QUERY_FILE_INFO on the file and then
5738                          * close it
5739                          */
5740                         status = open_fake_file(req, conn, req->vuid,
5741                                                 fake_file_type, smb_fname,
5742                                                 access_mask, &fsp);
5743                         if (!NT_STATUS_IS_OK(status)) {
5744                                 goto fail;
5745                         }
5746
5747                         ZERO_STRUCT(smb_fname->st);
5748                         goto done;
5749                 }
5750
5751                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
5752                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
5753                         goto fail;
5754                 }
5755         }
5756
5757         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
5758                 int ret;
5759                 smb_fname->stream_name = NULL;
5760                 /* We have to handle this error here. */
5761                 if (create_options & FILE_DIRECTORY_FILE) {
5762                         status = NT_STATUS_NOT_A_DIRECTORY;
5763                         goto fail;
5764                 }
5765                 if (req != NULL && req->posix_pathnames) {
5766                         ret = SMB_VFS_LSTAT(conn, smb_fname);
5767                 } else {
5768                         ret = SMB_VFS_STAT(conn, smb_fname);
5769                 }
5770
5771                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
5772                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
5773                         goto fail;
5774                 }
5775         }
5776
5777         status = create_file_unixpath(
5778                 conn, req, smb_fname, access_mask, share_access,
5779                 create_disposition, create_options, file_attributes,
5780                 oplock_request, lease, allocation_size, private_flags,
5781                 sd, ea_list,
5782                 &fsp, &info);
5783
5784         if (!NT_STATUS_IS_OK(status)) {
5785                 goto fail;
5786         }
5787
5788  done:
5789         DEBUG(10, ("create_file: info=%d\n", info));
5790
5791         *result = fsp;
5792         if (pinfo != NULL) {
5793                 *pinfo = info;
5794         }
5795         return NT_STATUS_OK;
5796
5797  fail:
5798         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
5799
5800         if (fsp != NULL) {
5801                 close_file(req, fsp, ERROR_CLOSE);
5802                 fsp = NULL;
5803         }
5804         return status;
5805 }